this programme would essentially be good dental and general health, with six healthy permanent maxillary anterior teeth of a Vita shade score of A2 or darker. Above all they should be willing for dental bleaching. The study teeth will be the four maxillary central and lateral incisors. The shade of the teeth will be evaluated using the Vita shade guide and photographs. The participants will be randomly assigned to one of the two experimental study groups. The dental shade, GI, PI, TV and tooth sensitivity of each participant will be assessed before application of dental bleaching, after two weeks, and after six months of treatment. The results would be arrived at by the quantitative analysis of the data procured.
Tooth discoloration may be due to several different types of causes and may vary in appearance, localization and severity. It may be classified as intrinsic, extrinsic, and a combination of both intrinsic and extrinsic (Hattab & Qudeimat, 1999)
Stubborn extrinsic discoloration and intrinsic stain are generally removed by the use of various bleaching techniques. Bleaching refers to the treatment, usually involving an oxidative chemical, that alters the light absorbing and/or light reflecting nature of a material structure, thereby increasing its value (whiteness).Vital tooth bleaching refers to external application of bleaching gel/ solution and is also known as night guard vital bleaching.
For vital tooth bleaching procedures, there is a wide array of whitening products available containing the whitening agent hydrogen peroxide (or one of its precursors, notably carbamide peroxide) which penetrates the tooth structure and oxidizes the colored compounds in the dentin (the second layer of the tooth). Products containing a concentration of 10% carbamide peroxide, come in a ‘tray’ which could be used by patients at home while the results and concentrations are monitored by a dental professional. Other materials based on higher concentrations of