Toothache in children should be found out the cause of the disease, and the pain caused by tooth decay needs to be filled or root canal treatment. The common cause of toothache in children is tooth decay, children like to eat sweet food or food with high sugar content, plus the long sleep time in children, the brain is in a state of inhibition, saliva secretion is reduced, plus children cannot brush their teeth well, so tooth decay is more common, if the tooth decay is shallow, the decayed tooth tissue can be removed by dental drill, and then dental filling treatment can be carried out to isolate the stimulation of the tooth nerve from the outside world. If the tooth decay is shallow, the decayed tooth tissue can be removed by dental drill, and then the tooth filling treatment can be carried out to isolate the stimulation of external cold, hot, acid and sweet to the tooth nerve. For children with toothache, if the tooth decay is deeper and the pain is caused by the nerve, root canal treatment is needed. Firstly, the hard tissue of the decayed tooth will be removed by drilling, and the nerve will be exposed and the nerve will be killed, or the pulp will be extracted under local anesthesia, then the root canal will be disinfected, and finally the root canal will be filled tightly to prevent reinfection and relieve the pain. Take care not to eat sweets and reduce the frequency of sugar intake. Brush your teeth well, once in the morning and once in the evening, and have regular oral examinations and follow-ups every three months. Therefore, children with tooth pain need dental filling treatment or root canal treatment. Brush your teeth well and follow up regularly.