I had yellow teeth and used Crest Whitening Strips to make them whiter. The only problem is that they start changing back to their yellow color. Does anyone have any tips or anything to keep them staying white after using the strips?
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stay away from coffee and cigarettes. brush your teeth a lot, floss, and use mouth wash. i used them before and i did it again a couple months later and nothing bad happened so you can always do them again.
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