Fillings in children can be painful, but the intensity of the pain depends on the condition of the tooth damage. Local anesthesia is needed during the filling process, the pain will not be very strong at this time, but when the anesthesia is invalidated, there will be soreness and pain. Details are as follows: 1. When filling the tooth: the tooth decay should be repaired as early as possible, if the degree of decay is not big, only the tooth enamel is slightly damaged, there is no big feeling when filling the tooth. However, if the caries is deep or the nerve has been injured, it is necessary to do the nerve treatment first, and the pain will be stronger. If pulp infection is found, local anesthesia will be carried out when filling the tooth, and the necrotic material needs to be cleaned out, there will be pain when playing anesthesia, and there is no obvious feeling during the filling process; 2.After filling: After the anesthetic agent is invalidated, there will be soreness and swelling on the cheek of the tooth repaired, but the pain is not very strong at this time, and it is within the tolerable range, and will disappear gradually within 48 hours. However, if there is a strong tingling sensation or spontaneous pain that does not subside, it may be caused by the filling material used to irritate the apical tissue of the tooth, or may be caused by incomplete pulp inactivation, and should be followed up by a doctor in time. After filling, you should try to eat less over-stimulating food and reduce the number of chewing, eat less hard things within 2-3 days after filling, and rinse your mouth or brush your teeth in time after eating to reduce the occurrence of pain.