The literature is rich with reports concerning the effects of in-office bleaching on natural teeth, but its effect on tooth-colored restorations is not, as yet, fully known. Resin composites are widely used as restorative materials because of their excellent aesthetic properties. However, their initial color may change over time as a result of surface and marginal staining, as well as internal material deterioration.5,6 Staining of resin composites by beverages such as coffee, tea, and soda or by mouth rinse agents has been reported to varying degrees.7–9 In addition to color, surface characteristics contribute significantly to the aesthetic quality of restorations. Surface roughness has a detrimental effect on light reflection, resulting in a dull appearance that stands out from the rest of the teeth. Moreover, rough surfaces promote bacterial plaque adhesion, with subsequent increased staining.10–13