If tooth sensitivity occurs after filling, including irritating pain to cold and heat, this situation is that before filling, the caries has been closer to the nerve, and during the process of filling, it may have caused stimulation to the pulp, or there is deeper caries, and no pulp pacification and cushioning is carried out. If the symptoms are not very serious, it can be observed, and if it is gradually relieved, no special treatment can be made. If the symptoms of tooth sensitivity have not been relieved, and some of them may be aggravated, it is necessary to follow up in time, remove the material of the filling, for the nerve of the tooth for pacification treatment, and then consider the padding and refilling. Therefore, if the tooth becomes sensitive after filling, you can observe it first and return to the hospital for follow-up if necessary.