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American Dental Association answeredNewly whitened teeth may absorb stains more easily. To keep your teeth white as long as possible, avoid tobacco and stain-causing beverages (such as coffee, cola, tea and red wine) for several days after whitening. Keep in mind that teeth usually return to their original shade over time. If you steer clear of tobacco and large amounts of stain-causing beverages, your teeth may remain bright for several years.