A 4-year-old lives in an area with water fluoride of 0.1 ppm. Per the supplementation schedule, what is the recommended daily fluoride supplement dose?

Correct answer: B. 0.5 mg

• A. 0.25 mg is the dose for ages 3–6 only when water fluoride is 0.3–0.6 ppm.
• B. Correct. For ages 3–6 with water fluoride <0.3 ppm, the schedule recommends 0.5 mg/day. At 0.1 ppm a 4-year-old falls here.
• C. 1.0 mg is reserved for children 6–16 years old when water fluoride is <0.3 ppm.
• D. Supplementation is withheld only when water fluoride is ≥0.6 ppm; 0.1 ppm is deficient.