There are countless studies showing how fluoride has many negative health effects. Any benefits that fluoridated water has is far outweighed by the dangers.
Begin researching these studies on my friend Google Scholar:
http://scholar.google.com/scholar?q=fluoride++iq&btnG=&hl=en&as_sdt=0%2C14
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5 RepliesThat explains the warning signs on toothpaste tubes