Clinical study of a halogen light-activated bleaching agent in nonvital teeth: case reports.

Clinical experience with an innovative, dual-action, in-office bleaching regimen that has both chemical and photoactivated mechanisms is described. This internal bleaching procedure was performed in three patients, each with different characteristics. In general, the results obtained were satisfactory. In the 6-month period of follow-up, no adverse effects related to the application of the bleaching agent were found. The different factors that may have influenced the results achieved are discussed.