State dental leaders met in South Carolina in 1951. The transcript of the meeting is on file at the Library of Congress.

Delegates  were told,

The question of toxicity is on the same order. Lay off it altogether. Just pass it over. “We know there is absolutely no effect other than reducing tooth decay,” you [are to] say, and go on. If it becomes an issue, then you will have to take it over, but don’t bring it up yourself.

A white paper issued by the American Dental Association in 1979 stated

Individual dentists must be convinced that they need not be familiar with scientific reports of laboratory and field investigations on fluoridation to be effective participants in the promotion program and that non-participation is an overt neglect of professional responsibility.

But there are dentists who have studied fluoridation, read the scientific studies and have concluded it does not prevent decay and causes harm to teeth and other organs and systems in the body.