Introduction to tooth whitening .
Whitening of teeth also known as dental bleaching is a procedure used in dentistry especially cosmetic dentistry. The procedure is performed to whiten teeth which have been colored over a period of time due to intake of colored fluids, bacterial staining, smoking and foodstuffs. Intake of certain medicines like the antibiotic tetracycline also result in the coloring of the teeth. Theshinign white nature of the teeth is due to the reflection of light on enamel a hard white substance which forms the protective outer covering of the teeth. Tooth whitening can be done in a number of ways . It can be performed either at the dentist or by self.