Children with toothache and swollen face can be treated separately after oral examination and whole-mouth surface tomography film, as follows: 1.Remove stagnant food: If there are more gaps in the teeth and a large amount of food fibers are embedded, which stimulates swollen gums, you can apply dental floss, toothpicks and flushers to remove the stagnant food and use 3% peroxide solution to rinse the gum pocket to relieve swollen gums. 2.Open pulp drainage: If X-rays show deep pulp of milk teeth If the X-rays show the acute periapical inflammation caused by the caries of the milk tooth, the pulp can be opened and drained, the infected pulp can be removed, and camphor phenol cotton can be placed to promote drainage. After the swelling subsides, root canal disinfection is performed and the canal cavity is closed with calcium hydroxide paste to repair the defect. If necessary, the abscess can be incised under local anesthesia, the abscess cavity can be separated, and rubber drainage strips can be placed. In case of recurrent infections due to the formation of residual roots and crowns in milk teeth, a gap retainer can be worn after extraction as soon as possible.