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What causes teeth to stain and turn yellow?

Dentist
Tufts University

Stains happen when dark foods (such as beets and berries) and beverages (think colas and tea) or substances in cigarette smoke adhere to plaque or tartar on the tooth's surface or penetrate into porous enamel. On top of that, tooth enamel thins with age, exposing the yellowish dentin underneath.

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