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Classify the degree of tooth mobility for a tooth with horizontal displacement of 2.76 mm and vertical mobility.
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The tooth should be classified as mobility grade 0.
| -1
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Identify the periodontal parameters that should be recorded during a full periodontal examination for a patient with a BPE score of 3 or 4.
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Only record plaque levels and pocket depths at a single site per tooth; recording bleeding on probing, mobility, recession and furcation involvement is not necessary.
| -1
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A patient's plaque score was 42% at baseline and 0% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is favourable.
| 1
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Identify the periodontal parameters that should be recorded during a full periodontal examination for a patient with a BPE score of 3 or 4.
|
Only record plaque levels and pocket depths at a single site per tooth; recording bleeding on probing, mobility, recession and furcation involvement is not necessary.
| -1
|
A tooth has 5 mm of gingival recession. Describe whether this would be considered severe recession and its clinical relevance.
|
A recession depth of 5 mm would be classified as moderate and has no clinical relevance.
| -1
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A molar tooth shows horizontal bone loss of approximately 18% of the furcation width. Classify the degree of furcation involvement.
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The furcation involvement should be classified as Grade 3.
| -1
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A patient's bleeding score was 29% at baseline and 1% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
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The bleeding improvement is favourable.
| 1
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A patient's plaque score was 32% at baseline and 8% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is not favourable.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 1.85 mm and vertical mobility.
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This corresponds to a mobility grade 3.
| 1
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A tooth has a gingival margin 2 mm coronal to the CEJ and a probing depth of 5 mm. Calculate the gingival recession and clinical attachment loss (CAL) and describe their significance.
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The gingival margin is 2 mm above the CEJ, so recession is recorded as −2 mm. CAL is probing depth minus recession: 5 − (−2) = 3 mm. Negative recession indicates the margin is coronal to the CEJ, while CAL reflects the true attachment loss.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.43 mm.
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This corresponds to a mobility grade 1.
| 1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 0.25 and bone loss of 0.3 mm over five years; no additional risk factors.
|
This corresponds to Grade B. The grade reflects the rate of progression: Grade A indicates slow progression (ratio <0.25 or <2 mm bone loss), Grade B moderate (ratio 0.25–1.0), and Grade C rapid (ratio >1.0 or ≥2 mm loss). Risk factors like smoking or uncontrolled diabetes shift the grade up.
| 1
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Explain the clinical significance of no bleeding on probing in a non‑smoker during periodontal probing.
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No bleeding on probing means disease is likely present.
| -1
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Explain the clinical significance of bleeding on probing in a smoker during periodontal probing.
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Bleeding on probing suggests that the tissues are healthy.
| -1
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A patient's bleeding score was 37% at baseline and 10% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
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The bleeding improvement is not favourable.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 2.64 mm.
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This corresponds to a mobility grade 3.
| 1
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A molar tooth shows horizontal bone loss of approximately 99% of the furcation width. Classify the degree of furcation involvement.
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This represents a Grade 3 furcation involvement.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.69 mm and vertical mobility.
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This corresponds to a mobility grade 3.
| 1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 6 mm and radiographic bone loss around 2% of the root, with 0 teeth lost.
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The patient should be classified as Stage I periodontitis.
| -1
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A molar tooth shows horizontal bone loss of approximately 62% of the furcation width. Classify the degree of furcation involvement.
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The furcation involvement should be classified as Grade 3.
| -1
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A molar tooth shows horizontal bone loss of approximately 86% of the furcation width. Classify the degree of furcation involvement.
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This represents a Grade 3 furcation involvement.
| 1
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Describe the correct technique for measuring and recording probing depths during periodontal charting.
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A periodontal probe is inserted parallel to the root surface and ‘walked’ gently around the gingival margin. Probing depth is measured from the gingival margin to the base of the periodontal pocket. Measurements are recorded at six sites per tooth: mesiobuccal, mid‑buccal, distobuccal, mesiolingual, mid‑lingual and distolingual. Depths of 4 mm or greater and sites that bleed on probing are documented in the chart.
| 1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 3 mm and radiographic bone loss around 1% of the root, with 0 teeth lost.
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These findings correspond to Stage II periodontitis. According to the 2017 classification, Stage II is defined based on clinical attachment loss and radiographic bone loss thresholds. Interdental CAL of 3 mm with radiographic bone loss of 1% falls within the range for Stage II, and 0 teeth lost fits the criteria.
| 1
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A patient's plaque score was 84% at baseline and 76% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is not favourable.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 1.9 mm and vertical mobility.
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This corresponds to a mobility grade 3.
| 1
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A patient has probing depths of 5 mm around a tooth, but the gingival margin is swollen and sits 3 mm coronal to the CEJ. Radiographs show no bone loss. Is this likely a pseudopocket or periodontitis, and why?
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This scenario likely represents a pseudopocket. Deep probing depths with a gingival margin coronal to the CEJ and no radiographic bone loss suggest gingival enlargement rather than true attachment loss. Periodontitis requires interproximal clinical attachment loss or bone loss.
| 1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 1.94 and bone loss of 1.4 mm over five years; the patient has poorly controlled diabetes.
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The appropriate grade is Grade B.
| -1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 4 mm and radiographic bone loss around 0% of the root, with 4 teeth lost.
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These findings correspond to Stage II periodontitis. According to the 2017 classification, Stage II is defined based on clinical attachment loss and radiographic bone loss thresholds. Interdental CAL of 4 mm with radiographic bone loss of 0% falls within the range for Stage II, and 4 teeth lost fits the criteria.
| 1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 1.42 and bone loss of 3.7 mm over five years; the patient smokes.
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The appropriate grade is Grade A.
| -1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 0.53 and bone loss of 2.4 mm over five years; no additional risk factors.
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The appropriate grade is Grade A.
| -1
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The cementoenamel junction (CEJ) is not detectable due to tooth wear. How should gingival recession and clinical attachment loss be recorded or estimated?
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If the CEJ is not detectable, gingival recession and clinical attachment loss cannot be recorded and should be omitted from the chart.
| -1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 1.83 and bone loss of 2.0 mm over five years; no additional risk factors.
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This corresponds to Grade C. The grade reflects the rate of progression: Grade A indicates slow progression (ratio <0.25 or <2 mm bone loss), Grade B moderate (ratio 0.25–1.0), and Grade C rapid (ratio >1.0 or ≥2 mm loss). Risk factors like smoking or uncontrolled diabetes shift the grade up.
| 1
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Describe the correct technique for measuring and recording probing depths during periodontal charting.
|
A periodontal probe is inserted parallel to the root surface and ‘walked’ gently around the gingival margin. Probing depth is measured from the gingival margin to the base of the periodontal pocket. Measurements are recorded at six sites per tooth: mesiobuccal, mid‑buccal, distobuccal, mesiolingual, mid‑lingual and distolingual. Depths of 4 mm or greater and sites that bleed on probing are documented in the chart.
| 1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 5 mm and radiographic bone loss around 5% of the root, with 3 teeth lost.
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These findings correspond to Stage III periodontitis. According to the 2017 classification, Stage III is defined based on clinical attachment loss and radiographic bone loss thresholds. Interdental CAL of 5 mm with radiographic bone loss of 5% falls within the range for Stage III, and 3 teeth lost fits the criteria.
| 1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 6 mm and radiographic bone loss around 6% of the root, with 0 teeth lost.
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The patient should be classified as Stage IV periodontitis.
| -1
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Identify the periodontal parameters that should be recorded during a full periodontal examination for a patient with a BPE score of 3 or 4.
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For patients with a BPE score of 3 or 4, probing pocket depths and bleeding on probing should be recorded at six sites around each tooth. A full baseline chart should also include tooth mobility, gingival recession, furcation involvement and suppuration to fully assess disease severity.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.92 mm.
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This corresponds to a mobility grade 1.
| 1
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A molar tooth shows horizontal bone loss of approximately 42% of the furcation width. Classify the degree of furcation involvement.
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The furcation involvement should be classified as Grade 3.
| -1
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A patient's bleeding score was 42% at baseline and 9% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
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The bleeding improvement is favourable.
| 1
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A patient has probing depths of 6 mm around a tooth, but the gingival margin is swollen and sits 3 mm coronal to the CEJ. Radiographs show no bone loss. Is this likely a pseudopocket or periodontitis, and why?
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This scenario likely represents a pseudopocket. Deep probing depths with a gingival margin coronal to the CEJ and no radiographic bone loss suggest gingival enlargement rather than true attachment loss. Periodontitis requires interproximal clinical attachment loss or bone loss.
| 1
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A patient's plaque score was 57% at baseline and 20% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is not favourable.
| -1
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A tooth has a gingival margin 3 mm coronal to the CEJ and a probing depth of 7 mm. Calculate the gingival recession and clinical attachment loss (CAL) and describe their significance.
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The recession is 3 mm and the CAL is 10 mm because you add the probing depth to the recession regardless of the margin position.
| -1
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Explain the clinical significance of no bleeding on probing in a non‑smoker during periodontal probing.
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No bleeding on probing suggests the periodontal disease is not active or progressing.
| 1
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Explain the clinical significance of bleeding on probing in a smoker during periodontal probing.
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Bleeding on probing suggests that the tissues are healthy.
| -1
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Explain the clinical significance of no bleeding on probing in a smoker during periodontal probing.
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No bleeding on probing reliably indicates healthy tissues.
| -1
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Describe the correct technique for measuring and recording probing depths during periodontal charting.
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Press the probe firmly into the gingiva and record only the deepest reading around each tooth; measuring all six sites or walking the probe is unnecessary.
| -1
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A tooth has 4 mm of gingival recession. Describe whether this would be considered moderate recession and its clinical relevance.
|
A recession depth of 4 mm is considered moderate. Gingival recession exposes the root surface, which can lead to dentin hypersensitivity and complicate plaque control. Recording recession helps assess treatment needs and contributes to the calculation of clinical attachment loss.
| 1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 1.55 and bone loss of 1.4 mm over five years; the patient smokes.
|
This corresponds to Grade C. The grade reflects the rate of progression: Grade A indicates slow progression (ratio <0.25 or <2 mm bone loss), Grade B moderate (ratio 0.25–1.0), and Grade C rapid (ratio >1.0 or ≥2 mm loss). Risk factors like smoking or uncontrolled diabetes shift the grade up.
| 1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 6 mm and radiographic bone loss around 39% of the root, with 1 teeth lost.
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The patient should be classified as Stage III periodontitis.
| -1
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A patient has probing depths of 8 mm around a tooth, but the gingival margin is swollen and sits 4 mm coronal to the CEJ. Radiographs show no bone loss. Is this likely a pseudopocket or periodontitis, and why?
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This is periodontitis because any probing depth over 5 mm automatically indicates periodontal disease, regardless of bone levels.
| -1
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A molar tooth shows horizontal bone loss of approximately 71% of the furcation width. Classify the degree of furcation involvement.
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This represents a Grade 3 furcation involvement.
| 1
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A patient's plaque score was 68% at baseline and 54% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is not favourable.
| 1
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A patient's plaque score was 77% at baseline and 17% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is favourable.
| 1
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A patient's bleeding score was 59% at baseline and 39% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
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The bleeding improvement is favourable.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.36 mm and vertical mobility.
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This corresponds to a mobility grade 3.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.15 mm and vertical mobility.
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The tooth should be classified as mobility grade 0.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 1.41 mm.
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This corresponds to a mobility grade 2.
| 1
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A patient's plaque score was 52% at baseline and 30% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is not favourable.
| 1
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A patient has probing depths of 8 mm around a tooth, but the gingival margin is swollen and sits 2 mm coronal to the CEJ. Radiographs show no bone loss. Is this likely a pseudopocket or periodontitis, and why?
|
This scenario likely represents a pseudopocket. Deep probing depths with a gingival margin coronal to the CEJ and no radiographic bone loss suggest gingival enlargement rather than true attachment loss. Periodontitis requires interproximal clinical attachment loss or bone loss.
| 1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 4 mm and radiographic bone loss around 33% of the root, with 5 teeth lost.
|
These findings correspond to Stage IV periodontitis. According to the 2017 classification, Stage IV is defined based on clinical attachment loss and radiographic bone loss thresholds. Interdental CAL of 4 mm with radiographic bone loss of 33% falls within the range for Stage IV, and 5 teeth lost fits the criteria.
| 1
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A patient's plaque score was 67% at baseline and 27% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
|
The improvement is not favourable.
| -1
|
Describe the correct technique for measuring and recording probing depths during periodontal charting.
|
Press the probe firmly into the gingiva and record only the deepest reading around each tooth; measuring all six sites or walking the probe is unnecessary.
| -1
|
Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 7 mm and radiographic bone loss around 73% of the root, with 4 teeth lost.
|
These findings correspond to Stage IV periodontitis. According to the 2017 classification, Stage IV is defined based on clinical attachment loss and radiographic bone loss thresholds. Interdental CAL of 7 mm with radiographic bone loss of 73% falls within the range for Stage IV, and 4 teeth lost fits the criteria.
| 1
|
Describe the correct technique for measuring and recording probing depths during periodontal charting.
|
Press the probe firmly into the gingiva and record only the deepest reading around each tooth; measuring all six sites or walking the probe is unnecessary.
| -1
|
A patient's bleeding score was 42% at baseline and 11% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
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The bleeding improvement is not favourable.
| -1
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A molar tooth shows horizontal bone loss of approximately 48% of the furcation width. Classify the degree of furcation involvement.
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The furcation involvement should be classified as Grade 1.
| -1
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A patient's plaque score was 51% at baseline and 28% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is favourable.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 2.86 mm.
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This corresponds to a mobility grade 3.
| 1
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A patient's plaque score was 78% at baseline and 25% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
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The improvement is not favourable.
| -1
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The cementoenamel junction (CEJ) is not detectable due to calculus deposits. How should gingival recession and clinical attachment loss be recorded or estimated?
|
If the CEJ is not detectable, gingival recession and clinical attachment loss cannot be recorded and should be omitted from the chart.
| -1
|
A patient's plaque score was 39% at baseline and 24% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
|
The improvement is favourable.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 2.27 mm.
|
This corresponds to a mobility grade 3.
| 1
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Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 6 mm and radiographic bone loss around 44% of the root, with 2 teeth lost.
|
These findings correspond to Stage IV periodontitis. According to the 2017 classification, Stage IV is defined based on clinical attachment loss and radiographic bone loss thresholds. Interdental CAL of 6 mm with radiographic bone loss of 44% falls within the range for Stage IV, and 2 teeth lost fits the criteria.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 1.01 mm.
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The tooth should be classified as mobility grade 3.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.88 mm and vertical mobility.
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This corresponds to a mobility grade 3.
| 1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 0.29 and bone loss of 1.9 mm over five years; the patient smokes.
|
This corresponds to Grade C. The grade reflects the rate of progression: Grade A indicates slow progression (ratio <0.25 or <2 mm bone loss), Grade B moderate (ratio 0.25–1.0), and Grade C rapid (ratio >1.0 or ≥2 mm loss). Risk factors like smoking or uncontrolled diabetes shift the grade up.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.03 mm and vertical mobility.
|
This corresponds to a mobility grade 3.
| 1
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Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 1.56 and bone loss of 0.0 mm over five years; the patient smokes and the patient has poorly controlled diabetes.
|
The appropriate grade is Grade B.
| -1
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A patient's bleeding score was 42% at baseline and 37% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
|
The bleeding improvement is favourable.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 0.42 mm.
|
The tooth should be classified as mobility grade 2.
| -1
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A patient's bleeding score was 60% at baseline and 27% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
|
The bleeding improvement is not favourable.
| -1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 2.93 mm and vertical mobility.
|
This corresponds to a mobility grade 3.
| 1
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Classify the degree of tooth mobility for a tooth with horizontal displacement of 2.3 mm and vertical mobility.
|
The tooth should be classified as mobility grade 2.
| -1
|
Determine the grade of periodontitis for a patient with a bone‑loss‑to‑age ratio of 1.65 and bone loss of 2.0 mm over five years; the patient smokes and the patient has poorly controlled diabetes.
|
This corresponds to Grade C. The grade reflects the rate of progression: Grade A indicates slow progression (ratio <0.25 or <2 mm bone loss), Grade B moderate (ratio 0.25–1.0), and Grade C rapid (ratio >1.0 or ≥2 mm loss). Risk factors like smoking or uncontrolled diabetes shift the grade up.
| 1
|
A patient's plaque score was 80% at baseline and 42% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
|
The improvement is not favourable.
| 1
|
Describe the correct technique for measuring and recording probing depths during periodontal charting.
|
A periodontal probe is inserted parallel to the root surface and ‘walked’ gently around the gingival margin. Probing depth is measured from the gingival margin to the base of the periodontal pocket. Measurements are recorded at six sites per tooth: mesiobuccal, mid‑buccal, distobuccal, mesiolingual, mid‑lingual and distolingual. Depths of 4 mm or greater and sites that bleed on probing are documented in the chart.
| 1
|
Differentiate between gingival recession and clinical attachment loss (CAL) in periodontal assessment.
|
Gingival recession and clinical attachment loss are the same and refer solely to the distance from the gingival margin to the apex of the root.
| -1
|
A patient's bleeding score was 49% at baseline and 37% at follow‑up. Assess whether bleeding improvement is favourable (≤30% bleeding or ≥50% reduction).
|
The bleeding improvement is favourable.
| -1
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Explain the clinical significance of bleeding on probing in a non‑smoker during periodontal probing.
|
Bleeding on probing suggests that the tissues are healthy.
| -1
|
A tooth has 3 mm of gingival recession. Describe whether this would be considered moderate recession and its clinical relevance.
|
A recession depth of 3 mm is considered moderate. Gingival recession exposes the root surface, which can lead to dentin hypersensitivity and complicate plaque control. Recording recession helps assess treatment needs and contributes to the calculation of clinical attachment loss.
| 1
|
A tooth has 3 mm of gingival recession. Describe whether this would be considered moderate recession and its clinical relevance.
|
A recession depth of 3 mm would be classified as mild and has no clinical relevance.
| -1
|
Describe the correct technique for measuring and recording probing depths during periodontal charting.
|
A periodontal probe is inserted parallel to the root surface and ‘walked’ gently around the gingival margin. Probing depth is measured from the gingival margin to the base of the periodontal pocket. Measurements are recorded at six sites per tooth: mesiobuccal, mid‑buccal, distobuccal, mesiolingual, mid‑lingual and distolingual. Depths of 4 mm or greater and sites that bleed on probing are documented in the chart.
| 1
|
Differentiate between gingival recession and clinical attachment loss (CAL) in periodontal assessment.
|
Gingival recession and clinical attachment loss are the same and refer solely to the distance from the gingival margin to the apex of the root.
| -1
|
A patient's plaque score was 73% at baseline and 6% at follow‑up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).
|
The improvement is not favourable.
| -1
|
A molar tooth shows horizontal bone loss of approximately 24% of the furcation width. Classify the degree of furcation involvement.
|
This represents a Grade 1 furcation involvement.
| 1
|
A molar tooth shows horizontal bone loss of approximately 51% of the furcation width. Classify the degree of furcation involvement.
|
The furcation involvement should be classified as Grade 1.
| -1
|
Explain how gingival recession should be measured and recorded in a periodontal chart.
|
Gingival recession is measured as the distance from the cementoenamel junction to the gingival margin. In a full periodontal chart, only one measure of the greatest extent of recession per tooth is recorded for baseline documentation.
| 1
|
Assign a stage of periodontitis to a patient with interdental clinical attachment loss of 4 mm and radiographic bone loss around 15% of the root, with 1 teeth lost.
|
The patient should be classified as Stage III periodontitis.
| -1
|
Describe the correct technique for measuring and recording probing depths during periodontal charting.
|
Press the probe firmly into the gingiva and record only the deepest reading around each tooth; measuring all six sites or walking the probe is unnecessary.
| -1
|
A molar tooth shows horizontal bone loss of approximately 31% of the furcation width. Classify the degree of furcation involvement.
|
The furcation involvement should be classified as Grade 2.
| -1
|
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in Data Studio
Periodontal-Reasoning-40k
40,000 periodontal clinical reasoning examples for off-policy RLHF (KTO/DPO).
Schema
prompt: instruction or questioncompletion: model responselabel: {+1, -1} preference label
Example
{"prompt": "A patient's plaque score was 35% at baseline and 1% at follow-up. Determine whether the improvement is favourable according to BSP criteria (≤20% plaque or ≥50% reduction).", "completion": "The improvement is favourable.", "label": 1}
Intended use
- KTO/DPO training; SFT warm-start from
label==1.
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