Want whiter teeth? If your pearly whites are dulled by surface stains, a whitening toothpaste may help lighten your teeth slightly.
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A whitening toothpaste can't change the natural color of your teeth, however.
For more noticeable results, ask your dentist about tooth-whitening bleaches.
Source: http://newsnetwork.mayoclinic.org/discussion/mondays-housecall-259940