Objective: The aim of this study was to evaluate the clinical performance Class I composites performed by undergraduate students at the Teaching Clinic UPC after 6 months. Material and Methods: A total of 47 class I restorations were clinically evaluated 6 months after placement, using USPHS criteria, describing color match, marginal adaptation, roughness, marginal staining, anatomy and secondary caries. Alpha, Bravo and Charlie where the coding, being excellent restorations, acceptable and unacceptable condition respectively. Results: At the 6-month follow-up, all restorations received the same initial scores with respect to each evaluation criterion. Color match, marginal adaptation, roughness, marginal staining and secondary caries scored Alfa at 100% (n = 47), and anatomical shape scored Alfa at 87.23 % (n = 41) and Bravo at 12.77 % (n = 6). Conclusion: All composites were clinically functional after 6 month and received the same initial scores with respect to each evaluation criterion.