There is a big difference between teeth brightening and teeth whitening. The bad marketing of dentists and pharmaceutical companies are making patients dream about hollywood smiles that do not exist.
Some food can brighten teeth: http://www.nogarlicnoonions.com/food-and-white-teeth-the-complete-series/
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Of course not. Banana won't make your teeth whiter like after a professional whitening, it will only clean them as it was said before by dr. Anthony.
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