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Can you explain how teeth whitening works? Probably not – not many people can! But you’re likely familiar with whitening toothpaste, mouthwash, and a number of other whitening products on the market. There are a wide variety of do-it-yourself teeth whitening methods to get the whiter smile you desire and they all work in different ways. Not every method works for everyone – it depends on the results you want and the severity of staining you’re hoping to combat.