The year before water fluoridation began in the United States, the entire dental profession recognized that fluoride was detrimental to dental health. In fact, in 1944 the Journal of the American Dental Association reported that using between 1.6 and 4 ppm (parts per million) fluoride in water would cause 50% of adults to need false teeth. On top of that, the world’s largest study looked at 400,000 students, revealing that tooth decay increased in over 25% with just 1ppm fluoride in drinking water.

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