Smile! How to Whiten your Teeth...
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“Teeth darken with age,” says Mike Malone, D.D.S., president of the American Academy of Cosmetic Dentistry. “Over the years the enamel thins to reveal the naturally yellow dentin, the underlying tooth structure.” The color of your teeth is partly determined by genetics, but food, coffee, tea, wine or smoking can also cause staining...
Smile!
How to whiten your teeth: from the drugstore to the dentist’s chair