Because of the tooth loss area is too large to cause the filling to fall out can not be secondary fillings, other reasons for the filling filling to fall out can also be secondary fillings. 1. When the tooth loss area is too large, resulting in the filling material can not be fixed in the defect, generally can not be filled twice, even if the second filling is also likely to lead to the filling material can not be fixed, you can consider the full crown restoration, the production of inlays and other ways to improve. 2. If the filling falls out because of the filling volume contraction, the filling around the tooth fracture, cavity edge secondary caries, etc., then you can carry out the second repair, the teeth can be restored to complete after the second repair. It is recommended to go to the hospital stomatology department immediately when the filling falls out, and the doctor will evaluate the specific situation and decide whether the filling can be replaced.