Nightguard bleaching to lighten a restored, nonvital discolored tooth.

Traditional techniques to lighten discolored endodontically treated teeth have used bleaching materials that had to be applied and directly monitored by dentists. These bleaching techniques have been associated with cervical resorption in nonvital teeth, and the treatment outcome is often difficult to predict. This article describes the use of nightguard bleaching to obtain an esthetic result for a restored nonvital tooth that had been treated with limited success with traditional office-based bleaching procedures.