Eight-year-old children with toothache should undergo an oral examination, take a whole mouth surface tomography, and then according to the specific circumstances of the treatment, respectively, as follows: 1, if the replacement of milk and permanent teeth, the crowns of the milk teeth and the gums are adhered to stimulate the gums to swell and pain, the milk teeth can be extracted under local anesthesia, and to promote the smooth eruption of the permanent teeth. 2, if the crowns of the new eruption of permanent teeth around the gums, adhering to a large amount of food debris resulting in gum swelling and pain, you can apply 3% hydrogen peroxide If deep caries cavities are formed in the baby teeth, which are easily embedded with large pieces of food, it is necessary to remove the decayed material and disinfect it with alcohol, apply calcium hydroxide as the base and then fill it with glass ionomer cementum, etc. 4. When pulpitis or apical periodontitis occurs in the baby teeth, it is possible to remove the pulp by grinding open the pulp cavity under local anesthesia, and then use calcium hydroxide or iodine imidization paste to fill the root canals in order to repair the cavities.