There are so many scientific studies showing the direct, toxic effects of fluoride on your body, it's truly remarkable that it's NOT considered a scientific consensus by now. Despite the evidence against it, fluoride is still added to 70 percent of U.S. public drinking water supplies.
A recently-published Harvard University meta-analysis funded by the National Institutes of Health has concluded that children who live in areas with highly fluoridated water have "significantly lower" IQ scores than those who live in low fluoride areas.
Read more:
http://www.huffingtonpost.com/dr-mercola/fluoride_b_2479833.html
Read the Harvard study:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3491930/