Public Health · single question
Which product is CONTRAINDICATED in a patient presenting with active dental erosion?
Show answer and explanation
Correct answer: C. Acidulated phosphate fluoride (APF) gel
- A. NEUTRAL SODIUM FLUORIDE (pH ~7) is the correct choice for erosion patients — it delivers the fluoride benefit without any acid challenge, and is also the safe option around ceramic and composite restorations.
- B. Fluoride VARNISH is neutral, well tolerated and appropriate here; it also provides prolonged contact time with the tooth surface.
- C. CORRECT. APF gel has a pH of approximately 3.5 — well below the critical pH for enamel dissolution. Applying a strongly acidic product to teeth already undergoing acid-mediated dissolution adds to the very insult you are trying to arrest. APF is separately contraindicated in patients with porcelain, composite or glass ionomer restorations, because the acid etches and roughens those surfaces.
- D. CPP-ACP paste supplies bioavailable calcium and phosphate to support remineralization and is well suited to erosion management.
Note: Erosion management: identify and remove the acid source (dietary, gastric reflux, eating disorder, occupational), advise rinsing with water rather than brushing immediately after an acid exposure, and use NEUTRAL fluoride. Never reach for APF in these patients.