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Milk and other dairy products are the primary dietary source of calcium, which is essential for healthy teeth. Calcium is the key ingredient in a mineral, known as hydroxyapatite, that strengthens tooth enamel as well as bones. (Teeth aren't bones, technically, but they share some of the same properties.)

Dairy products—especially cheese—also contain casein, a type of protein. Research suggests that caseins, along with calcium, play an important role in stabilizing and repairing tooth enamel.

(Getty Images)

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