Children’s cavity rates are similar whether water is fluoridated or not, according to data published in the July 2009 Journal of the American Dental Association by dentist J.V. Kumar of the NY State Health Department (1).
 

There is clear evidence that small amounts of fluoride, at or near levels  purposely added to many water supplies, present potential risks to the thyroid gland, according to the National Research Council’s (NRC) first-ever published review of the fluoride/thyroid literature.(A)

Fluoride: A Pain in the Neck - Case Report