For children with tooth decay, the first step is to avoid chewing on the affected side to avoid increasing pain or spreading the infection, and to seek medical attention in time to choose the appropriate treatment. Patients are advised to do root canal filling treatment and crown restoration. It can also be combined with medication. 1. Root canal treatment: Root canal treatment is to remove the necrotic or inflamed pulp and sterilize the root canal and then fill it, generally speaking, root canal treatment requires 3~4 times, the first time under local anesthesia to open the pulp and sealing, the second time to clean the root canal and sealing, and the third time for root filling. Afterwards, restorative treatment can be chosen to restore the function of the affected tooth. Specific treatment steps need to be determined according to the condition of the affected tooth. 2. Medication: If the tooth decay is painful, you can take oral painkillers to relieve the pain or anti-inflammatory drugs, such as cephalosporins, metronidazole and other anti-inflammatory treatments. No matter which kind of drugs are not a complete cure for toothache, want to completely solve the tooth pain, you need to root canal treatment of the tooth. For specific cases, please consult a regular dental hospital for symptomatic treatment.