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RealAge answeredThe 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.