http://www.icnr.com/articles/national-fluoride-tooth-decay-study....

http://www.icnr.com/articles/national-fluoride-tooth-decay-study.html

U.S. Public Health Service
(National Institute of Dental Research)
NIDR Study Shows No Relationship
Between Fluoridation and Tooth Decay Rate


Data collected by the National Institute of Dental Research (NIDR) of the United States Public Health Service (USPHS) produced the largest and most extensive database ever used to determine whether there is a relationship between fluoridation and tooth decay. Released on June 21, 1988, the $3,670,000 nationwide survey examined 39,207 U.S. school children aged 5-17 from 84 different geographical areas.

Of the 84 areas, 28 had been fluoridated for 17 years or more, 29 had never been fluoridated, and 27 had been only partially fluoridated or fluoridated for less than 17 years. Age-adjusted tooth decay rates for the permanent teeth of children were determined for each of the 84 areas which were then listed in the order of increasing tooth decay rates. The listing showed clearly that there was no relation between tooth decay rates and fluoridation. Ironically, the lowest tooth decay rate reported in the survey occurred in a nonfluoridated area.