Preventing Teeth Stains
As we age, the outer layer of tooth enamel wears away. The underlying layer, called dentin, is more yellow. That's why it's important to avoid teeth stains in the first place – especially after whitening. If you take care with foods and drinks that cause tooth discoloration, the results of teeth whitening may last up to one year. Whitening teeth too often could make them look translucent and blue – so you'll want to maintain your new smile.
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