Abstract : The aim of our study was to correlate between two types of office bleaching materials with two different concentrations on surface roughness of composite. We made a forty five cylindrical specimens which were divided into three groups: Group A (Voco): Subdivided into: A1 (no bleaching): Specimens were placed for two weeks in artificial saliva. A2: In which office bleaching agent containing 35% HP was applied on composite specimens. A3: In which office bleaching agent containing 32% HP was applied on composite specimens. Group B (Z350): Subdivided into: B1 (no bleaching): Specimens were placed for two weeks in artificial saliva. B2: In which office bleaching agent containing 35% HP was applied on samples. B3: In which office bleaching agent containing 32% HP was applied on samples. Group C (P60): Subdivided into: C1 (no bleaching): Specimens were placed for two weeks in artificial saliva. C2: In which office bleaching agent containing 35% HP was applied on composite specimens. C3: In which office bleaching agent containing 32% HP was applied on composite specimens. Scanning electron microscope and Atomic force microscope were used to evaluate roughness. ANOVA and LSD tests were applied to evaluate the significance between groups. A highly significant increase in roughness was observed when compared to control groups (P < 0.01). The highest value for roughness was observed in A2 group (36.26 nm), whereas B1 showed the lowest value (16.17 nm). The office bleaching material used has led to surface roughness alteration for all groups.