Pediatric Dentistry · single question
A 4-year-old lives in a community with 0.3 ppm water fluoride. How much supplemental fluoride daily?
Show answer and explanation
Correct answer: B. 0.25 mg/day
For a 4-year-old (ages 3–6) with water at 0.3 ppm (at threshold), the supplement is 0.25 mg/day per ADA guidelines. 0.50 mg/day applies when water is below 0.3 ppm for this age group.
- A. ❌ 0.50 mg/day is for ages 3–6 when water is BELOW 0.3 ppm.
- B. ✅ CORRECT – For ages 3–6 with water at 0.3 ppm: 0.25 mg/day.
- C. ❌ 1.00 mg/day is for ages 6–16 with water below 0.3 ppm.
- D. ❌ A supplement IS needed since water is at the threshold.
Practice Pediatric Dentistry questions Pediatric Dentistry study notes