Discolored teeth... brown, yellow, gray, etc.... can result from different causes. When selecting a teeth whitening product, it can be helpful to have an understanding of why your teeth aren't white.

Here are the primary causes.

1. Genetics: it's possible to be born with teeth that aren't very white. Slap your mama for this one. ONLY KIDDING! : )

2. Trauma: If you were in an accident in which a tooth was broken, hit, or chipped, it may be discolored as a result of bleeding inside the tooth.

3. External Staining: As you know, smoking and certain beverage like tea, coffee, and soda, can dull your teeth's whiteness.

4. Aging: Our teeth are porous and as we get older, they lose their luster.

5. Medications: Certain drugs, like tetracycline, can discolor teeth.

Okay, now here's the good news. eBay offers a wide range of teeth-whitening products to bring about a more beautiful smile: including toothbrushes, toothpaste, tooth whitening systems and kits, other brands such as Crest Whitestrips, Opalescence Teeth Whitener, Nite White Excel ACP, Listerine Strips, and Teeth Whitening Bleach Gel, and Cheap Waterpiks. And, all of this at an affordable price. Click the links to check the auctions.

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