The purpose of this study was to evaluate the effect of 20% Carbamide peroxide (CP), 10% Carbamide peroxide (CP) and 25% Hydrogen peroxide (HP) on surface roughness of enamel. No significant differences were found among the bleaching groups (2-3-4). However, all bleaching agents produced a significant increase in the mean surface roughness of enamel compared to the untreated control group (1) (p<0.05).
El Halim SAMA (2012) Effect of Three Bleaching Agent on Surface Roughness of Enamel (In-vivo Study). Dentistry 2:133.