The maintenance time after repairing a cavity depends on the patient’s specific condition, the later maintenance, whether the doctor’s treatment is thorough and other factors, and cannot be generalized. In general, tooth decay needs to be treated as early as possible, otherwise the bacteria will continue to invade along the dentin tubules, and even the bacteria can reach the pulp, if the patient carries out filling treatment in time, it can fully restore the normal function. Generally speaking, shallow caries and medium caries can be maintained for a long time or even for a lifetime after filling because the decayed tissue is relatively shallow. In case of deep caries, if the decayed material is not removed, or the patient does not keep good brushing habit, which leads to the bacteria continue to attack, it may develop to pulpitis in a few months or so. In addition, patients also need to pay attention that after filling, they should try to eat less hard and sticky food to avoid the filling from falling off, and also try to avoid the stimulation of too cold and too hot food. If the affected tooth has a large defect, inlay or full crown restoration treatment may be recommended depending on the situation to restore good form and function.