|Fluoride Ion Level in Drinking Water a|
|Age||< 0.3 ppm||0.3–0.6 ppm||> 0.6 ppm|
|6 months–3 years||0.25 mg/day b||None||None|
|3–6 years||0.50 mg/day||0.25 mg/day||None|
|6–16 years||1.0 mg/day||0.50 mg/day||None|
a 1.0 ppm = 1 mg/L.
b 2.2 mg sodium fluoride contains 1 mg fluoride ion.
Reproduced with permission from the American Dental Association from ADA Guide to Dental Therapeutics (2nd ed.).