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Tooth bleaching technique has presented a significant evolution, promoting higher satisfaction and comfort to the patients. Therefore, the aim of this study was to present the bleaching agents and the techniques, discussing advantages and disadvantages of each one, and the effect of these agents in the oral environment. The main agents used in the bleaching technique are the hydrogen peroxide and the carbamide peroxide, promoting the bleaching effect through oxidation of organic compounds. The application of these agents can be made at home or at a doctor office. During treatment, it may occur some adverse effects, such as tooth sensibility, increasing of dental porosity, and some interactions with the restorative material. However, these adverse effects can be eliminated or controlled when the treatment is executed under professional orientation. When the bleaching technique is well indicated and correctly conducted, it is associated with significantly positive results.

There were 72 fractures in 50 patients. Three years after the injury, 7.6% (17/222) of teeth remain denervated. The most denervated teeth are molars while the least denervated are incisors. During the second and the third year following injury 3 teeth were devitalized which is 1.35% of the initially "avital" teeth or 17.6% of those denervated after one year. Good reposition is no guaranty for reinnervation. Denervation may occur even without dislocation. The dental pulp is vitally stable one year after the mandibular fracture. Denervated tooth is not devitalized and should not be treated if neither clinical nor radiologic signs of devitalization are present.