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The length of time it takes to whiten your teeth will vary with the amount of discoloration of your teeth. For treatments performed by your dentist, it generally takes 30-90 minutes per visit to make your teeth brighter. It may require as little as one visit and up to ten visits over a period of time. Over-the-counter products may require you to wear a mouthpiece anywhere from 30 minutes a day to overnight for up to a month.
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