Pathology · single question
For a bulimic patient with enamel erosion, what should NOT be applied at the dental appointment?
Show answer and explanation
Correct answer: B. Acidulated phosphate fluoride (APF) foam
APF (acidulated phosphate fluoride) foam has a pH of approximately 3.5 — it is HIGHLY ACIDIC. In a bulimic patient with already severely eroded, weakened enamel, APF causes further acid etching and erosion. These patients should receive NEUTRAL sodium fluoride (pH ~7) varnish or gel instead.
- A. ❌ Neutral NaF varnish IS appropriate — the recommended fluoride type for erosion patients.
- B. ✅ APF foam is CONTRAINDICATED for bulimic patients — its acidity causes further enamel erosion.
- C. ❌ Sodium bicarbonate rinse NEUTRALIZES acid — appropriate for bulimic patients after purging.
- D. ❌ Water rinse after purging (before brushing, to neutralize before abrasive brushing) is recommended management.