Tooth whitening (termed tooth bleaching when utilizing bleach), is either restoration of natural tooth shade or whitening beyond natural tooth shade.Bleaching methods generally use carbamide peroxide or hydrogen peroxide which bleaches the tooth enamel to change its color. Bleaching solutions is applied directly to the teeth. Carbamide peroxide reacts with water to form hydrogen peroxide. The peroxide penetrates the porosities in the rod-like crystal structure of enamel and breaks down stain deposits in the dentin. Results remain for 2-3 years depending on the manufacturing company.
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