Fluoride

What It Is: A form of the basic element fluorine

Found In: Toothpaste, tap water

Health Hazards: Neurotoxic and potentially tumorigenic if swallowed; the American Dental Association advises that children under 2 not use fluoride toothpaste

What You Should Know: Government studies support current fluoride levels in tap water, but studies on long-term exposure and cancers are ongoing

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