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Earlier this year, the American Dental Association recommended parents use a tiny amount of fluoride toothpaste on children before they turn 2, though fluoride remains controversial in some circles amid allegations–based, medical officials say, on questionable science–that fluoride is a carcinogen and can lower children's IQs.  In 2012, New Jersey was embroiled in the controversy when it considered legislation that would require each town in the state to fluoridate its water.

Image: Baby teeth, via Shutterstock