Dentist dispensed systems have shown great efficacy, safety, and satisfying results for many people. That depends on the type of discoloration. Two to six weeks of treatment is average, although some people notice definite results in as little as 4 to 5 days. Tetracycline stained teeth may require extended bleaching for several months. The bleach contains carbamide peroxide and it has been extensively researched and proven safe when properly used.
Some people experience tooth sensitivity while bleaching.
This is transient and normal sensation returns shortly after completing the bleaching process. Your dentist will work with you to determine the length of time to wear your bleach tray to minimize sensitivity. Gum irritation has also been reported. These products promise a lot, but their results are not as reliable nor as effective as professionally dispensed systems. The whitening of dental bleaching systems occurs as an oxidation process inside the tooth.