A 13-year-old has caries on #19 and #30 plus multiple white spot lesions. What is the most appropriate INITIAL preventive measure for this high-caries-risk patient?

Correct answer: C. Fluoride-containing toothpaste and professional fluoride application

• A. Chlorhexidine is an adjunct (and not for indefinite daily use) — not the primary initial preventive measure.
• B. Disclosing tablets help motivate hygiene but are an educational adjunct, not the key anticaries intervention.
• C. Correct. Fluoride is the cornerstone of caries prevention: prescription/OTC fluoride toothpaste plus professional topical fluoride remineralizes white spots and prevents new lesions in a high-risk patient.
• D. Systemic antibiotics do not prevent caries and would cause resistance/harm — inappropriate.