Under normal circumstances, the service life of resin filling is 3-5 years. The specific service life depends on the patient’s decay degree, material performance, care measures and other factors. First of all, the larger the size of the defect, the more force the filling area will bear during the daily biting or chewing process. Therefore, the service life of resin material will be relatively shorter for large defective teeth. Secondly, the performance of the resin filling material is an important factor in determining its service life. Depending on the performance of the resin material, such as wear resistance, oxidation resistance, hardness, etc., it will also cause the difference in service life. Finally, with proper daily care measures, premature fracture and loss of filling materials can be effectively prevented. Specific measures include paying attention to oral hygiene, avoiding contact with hard objects, and customizing shell crowns. After resin filling treatment, patients should avoid using the filling side to chew hard food for 24 hours. If there is persistent pain and swelling in the oral area, timely follow-up treatment is required.