Teeth whitening is a common process in general dentistry, especially in the field of cosmetic dentistry.[1][2][3] The process of teeth whitening is a change from the color of the tooth to a lighter color and is considered a conservative way to treat tooth discoloration and meets the needs of an increasing number of patients who demand a whiter smile [4] [5] Moreover, teeth whitening is technically easier and less expensive than any other method. Another type of cosmetic treatment, such as veneers. Teeth whitening can be achieved either by changing the internal color or by removing and controlling the formation of external stains. [6]
The color of the teeth changes with age, becoming less white due to the changes that occur, as the enamel layer becomes less due to erosion and the appearance of the dentin layer, which is darker in color than the enamel layer.[7] Teeth may be stained by bacterial dyes, food residues, and tobacco. In addition, there are certain types of antibiotics (such as tetracyclines) that may cause tooth discoloration or change the color of the teeth to a gray color, whether the teeth are brown or permanent.[8][9] There are many ways to whiten teeth, such as chemical whitening, laser whitening, or by using commercial materials such as whitening strips or whitening pastes.
