Two of the most widely-used agents in teeth whitening are hydrogen peroxide and carbamide peroxide. Thousands of years ago, people didn't know these.
The earliest teeth whiteners were, to say the least, abrasive or corrosive in nature. Whereas the ancient Romans had urine, the ancient Egyptians had powdered pumice. Although these are no longer acceptable by today's cosmetic dentistry standards, it's safe to say that a cosmetic dentist in Wilkes Barre today wouldn't be what he is today if it weren't for.
http://www.backmountaindental.com/blog/info-articles/before-the-cosmetic-dentist-in-wilkes-barre-these-whitened-your-teeth.php
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