Children’s toothache may be due to dental caries, acute pulpitis, acute periapical periodontitis, etc., should be promptly to the hospital to clarify the cause of the disease, the treatment includes artificial materials, filling, root canal treatment. 1. Dental caries: children with dental caries, when the cavity is close to the pulp cavity, once eating cold, hot, sour, sweet and other stimulating foods, or food embedded into the cavity, may cause toothache symptoms. The doctor will remove the decayed tooth tissue and then fill the cavity with artificial material to relieve the symptoms of toothache and restore the shape of the tooth tissue and chewing function. 2. Acute pulpitis: If children have acute pulpitis, the clinical symptoms often show toothache, the pain is usually more intense, mostly spontaneous pain or nocturnal pain. Doctors will carry out root canal treatment to remove the necrotic pulp, then root canal filling, and finally repair the crown according to the situation. 3. Acute periapical inflammation: If a child has acute periapical inflammation, a toothache may occur when bacteria and inflammatory exudate stimulate the pain receptors in the periodontium around the root tip. The doctor will perform root canal treatment to remove the infected material around the root tip and crown the tooth as appropriate. Parents should follow the doctor’s instructions and actively cooperate with the doctor to treat their children, do not blindly treat yourself to avoid delaying the condition.