Since not all the dental discolorations can be bleached effectively, it is important to recognize the etiology of discoloration and to communicate the information to the patient, along with the available treatment options, alternative treatment, and their potential outcomes. Nonvital bleaching is indicated when the discoloration is due to pulpal necrosis, pulpal hemorrhage, endodontic filling materials, or mild to moderate tetracycline most important prerequisite for internal bleaching of a tooth is the quality of the endodontic therapy. Nonvital bleaching procedure should be avoided when the root canal treatment is inadequate. Superficial enamel stains can be removed by pumice polishing, microabrasion, or an external bleaching.
