Is your water contaminated with either fluoride or arsenic?
Fluoride compounds which are put in water (fluoridation), toothpaste and supplement tablets (including some vitamins) were never tested for safety before approval. Recent independent research by scientists not associated with dental trade organizations has shown the following:
NRDC analyzed data compiled by the U.S. Environmental Protection Agency on arsenic in drinking water in 25 states. Our most conservative estimates based on the data indicate that more than 34 million Americans drink tap water supplied by systems containing average levels of arsenic that pose unacceptable cancer risks. We consider it likely that as many as 56 million people in those 25 states have been drinking water with arsenic at unsafe levels -- and that's just the 25 states that reported arsenic information to the EPA.