Objective: This study evaluated the bleaching effect of commercial bleaching agents on composite materials, and the surface properties of smoothness and microhardness on the same. Materials and methods: 45 samples were divided into three equal groups depending on the type of composite. All three groups of composites shared the same color, A2. Within each group of composites (n=15), three whitening agents were used: activated carbon, lemon juice and baking soda paste, and baking soda. The bleaching index was tested at the beginning of the research with a spectrophotometer. The surface smoothness was tested with the Surface Roughness Tester K210, and the surface microhardness with the Vickers test. All three parameters were tested again 14 days after the start of the application of the whitening agents. Results: ANOVA test confirmed a statistical significance of all bleaching agents on smoothness and brightness parameters. The effect on smoothness and brightness depends significantly on the type of composite on which it is applied, and on the means used. Thus, the treatment with soda and lemon affects the brightness of the EvoCeram and Bulkfill materials, while the treatment with soda affects the brightness of the EvoCeram material. The charcoal bleaching treatment did not affect the brightness of either material, and neither agent affected the brightness of the EvoFlow material. When it comes to roughness, soda bleaching increased the roughness of the EvoCeram material and charcoal bleaching increased the smoothness of the BulkFill material. At a statistical significance level of at least 5%, the soda-lemon bleaching treatment did not affect the roughness of either material. Also, none of the agents affected the roughness of the EvoFlow material at the aforementioned level of statistical significance. As far as microhardness is concerned, the impact of all bleaching agents on its reduction is visible. Conclusion: All bleaching agents showed a significant influence on microhardness, on all composite samples. The effect on smoothness and brightness is variable and depends on the applied agent and the composite sample.