Background: Public health problems associated with oral disease affect large numbers of people in countries around the world. Dental caries continues to be the main cause of premature tooth loss in patients and can negatively affect the Quality of life (QoL) related to oral health for both the individual and their family. Depending on their stage of advancement of caries, a restorative procedure is required, since caries injuries generally involve changing the shape, function or esthetics, restoring is intended to extend the life of the teeth, The purpose of this study was evaluated direct restorations on posterior teeth with conventional and bulk-fill composite resins performed by public health professionals and their effect on Quality of life. Methods: The sample consisted of 100 teeth in 50 patients. The teeth selected for the restorative procedure were randomized in the two study groups according to restorative material. Group 1 - Bulk fill composite resin, or Group 2 - Conventional composite resin. At the end of 12 and 24 months, the restorations were evaluated according to USPHS criteria, by two evaluators. To evaluate the Quality of Life related to oral health, Oral Health Impact Profile – 14 (OHIP-14) was used before and after restorative treatment (12 months). Results: After 12 months, 90 restorations were evaluated that showed no statistical difference (p> 0.05), after 24 months, 80 restorations evaluated and also showed similar clinical performance and no statistical difference (p> 0.05). The analysis of quality of life detected a statistical difference only in the psychological discomfort domain (p = 0.024), improving their values at the end of the treatment. There are no differences between the clinical performance with conventional resins or bulk-fill system. Restorative treatment improved the perception of concern and stress suffered by patients by dental problems. Clinical Trial Registry: RBR-7hbmjp