When a large tooth that has been filled begins to hurt again, a basic determination should be made based on how long it has been since the filling began to hurt. If the pain started just after the filling, it is important to distinguish whether the material applied during the filling and the power system have caused some irritation to the pulp of the tooth. In case of irritation, anti-inflammatory and pain-relieving drugs can be applied symptomatically. If the pain is significantly relieved, it can be observed for a period of time and there is no need to continue treatment. If there is a mistake in the judgment of the pulp when filling the tooth, and the pulpitis is treated as a caries, then the filled material can only be removed and the tooth can be repaired after root canal treatment. If it takes a long time for the tooth pain to appear after the filling, it is necessary to be alert to the presence of secondary caries.