Nightguard vital bleaching removes brown discoloration for 7 years: a case report.

Nightguard vital bleaching with 10% carbamide peroxide was used to remove a brown stain from the maxillary central incisor of a 13-year-old-boy. After 7 years, during which there was no touch-up treatment, the discoloration had not returned. This conservative technique should be considered before more invasive procedures for the treatment of discolored vital teeth in young patients.