A 4-year-old child lives in an area with negligible water fluoride (below 0.3 ppm). What daily fluoride supplement is recommended?

For ages 3-6 years with water fluoride below 0.3 ppm, the recommended supplement is 0.50 mg/day; a 4-year-old falls in this bracket.Other options: 0.25 mg applies to the 6-month to 3-year bracket; 1.00 mg applies to ages 6-16; supplementation is indicated when water fluoride is low.Key exam takeaway: Fluoride supplement (water <0.3 ppm): 6 mo-3 yr = 0.25 mg; 3-6 yr = 0.50 mg; 6-16 yr = 1.0 mg.