Fig. 1From: Efficiency of tooth bleaching agent on staining and discoloration characteristics of nicotine stained dental enamel modelBlock diagram of the tooth-bleaching agent in a liquid form for the stained dental enamel model. Percent represents the weight per volume (%w/v) and n = 36. The stained enamel specimens of each nicotine dosage were treated with different 1 mL bleaching liquid formulations for a period of 30 min contact durationBack to article page