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Treatment of dental discolorations with external bleaching is becoming very common in dentistry, however, possible irreversible alterations on enamel surface due to bleaching procedures is a topic of discussion. The aim of this study was to evaluate the clinical effects of bleaching by measuring the dental plaque accumulation on human enamel and tooth discoloration in vivo. Forty-four teeth in eleven patients not revealing any restorations or periodontal problems were enrolled in this study.pmid:18379454 fatcat:dzpso23a2ngl3afk3ta5lukwzi