Usually after a tooth has been filled, if there is a loss of filling material, it is possible to have the tooth filled again. The reason why a filling falls out may be caused by poor brushing and secondary caries at the edge of the filling material, or it may be caused by the filling process not being tight enough, resulting in a gap between the filling material and the tooth. If it is caused by secondary caries, the decayed tissues need to be thoroughly removed with a spatula or a turbine dental drill, then rinsed, disinfected, insulated from moisture, and blown dry before filling and restoring the tooth with dental materials. If the patient’s filled tooth is repeatedly lost, a full crown restoration or inlay restoration may be needed to avoid repeated loss of the filled tooth. It is recommended that patients pay attention to oral hygiene in general, and go to the dentist in time for any dental discomfort.