Sixty patients received a prophylaxis (cleaning and polishing) before beginning of treatment. Each patient was evaluated for initial shade by Vita shade guide. Safety issues evaluated were the changes in gingival index (GI), plaque index (PI), (Loe-Silness Scale) Non-marginal gingival index (NMGI), non-gingival oral mucosal index (NGOMI) (Curtis and colleague). The patient`s perceptions about bleaching technique after treatment were evaluated. Tooth sensitivity (TS) during treatment and post treatment was evaluated. 10% Carbamide peroxide (opalescence tooth whitening gel, ultradent products inc.) was used for bleaching teeth in a custom made maxillary tray for the placement of bleaching gel. After initial evaluation and prophylaxis,the subjects were instructed to wear the tray with bleaching gel over-night. The treatment was continued for at least four weeks. After treatment the patient were seen after 6, 12, 18, and 24 week. There were mean scores with standard deviation of shades of teeth of 60 patients at base line. 80% of the patients had no change in the color after 6 months evaluation. 68.3% patients were glad with a treatment. There were mean value with standard deviation of PI, GI, NMG and NGOM was p>0.05 i.e. statistically not ` significant. On the basis of study night guard vital bleaching procedure is regarded as safe and effective.
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