Composite resins have been controversial. Wattanapayungkul et al found that bleaching with 35% hydrogen peroxide was not detrimental to the surface finish of composites,17 while Moraes et al found that bleaching using 35% hydrogen or carbamide peroxide resulted in significantly higher surface roughness in microhybrid, but not in microfilled, composite resins.35 Silva et al found in an in situ study that bleaching using 35% hydrogen peroxide paint-on whitener had no significant effect on surface roughness of posterior composite or on microfilled composite.13 In this study, surface roughness was measured at baseline then after the first and second bleaching sessions; the results correlated well to the color changes obtained. It was interesting to observe that the different shades of composites behaved differently in terms of surface roughness in response to the different bleaching treatments. In the A2 shade, TPH3 showed significantly higher surface roughness than DF, which is explainable when one knowing that DF is a microfilled composite with smaller filler particle size compared to TPH3, which is a microhybrid composite with variable size fillers. In contrast, with A4 shade, the reverse was encountered. DF had significantly higher surface roughness, an observation that could not be explained within the scope of this study but indicates that different shades of the same composite might behave differently under the same conditions.