Children’s milk tooth pain may be caused by dental caries, pulpitis, apical periodontitis, etc. It is recommended to go to the hospital as soon as possible for examination and treatment under the guidance of the doctor, such as filling surgery, root canal treatment, etc. 1. Dental caries: the pain of the child’s milk teeth is likely to be caries, chronic bacterial, progressive destructive lesions of the hard tissues of the teeth. Early filling should be done, and root canal treatment or extraction is needed when the symptoms are serious. 2. Pulpitis: The occurrence of pulpitis is generally related to bacterial infection, further aggravation of dental caries, etc., and patients will have more obvious symptoms of toothache. Surgical treatment is usually the mainstay, such as pulpotomy, root canal treatment, pulpotomy, etc. For teeth that cannot be retained, they should be extracted to prevent further development of the disease. 3. Periapical inflammation: Periapical inflammation can be caused by the further spread of caries, pulpitis and other lesions to the periapical area, and the patient will also have severe pain. If purulent lesions are present, incision and drainage of pus or opening and drainage of the pulp, etc. should be carried out to relieve the acute inflammation, and the commonly used treatment is root canal therapy. In addition to the above factors, it may also be caused by other reasons, it is recommended to take the child to the doctor for standardized treatment in a timely manner.