Children with toothache and swollen face can get well in 3-5 days, the details are as follows: 1.2-3 days: If the adjacent surface of the milk tooth is embedded with a large amount of food fiber, stimulating the gum swelling and pain, you can apply hydrogen peroxide solution to rinse the periodontal pocket and apply iodine glycerin, the swelling and pain will disappear after 2-3 days. 2.3-4 days: If a large amount of food soft scale is attached around the newly erupted crown, causing gum swelling and pain, you can apply tooth flush, etc., to remove the soft scale or The swelling will subside after 3-4 days. 3.3-5 days: If the milk tooth forms deep cavity and causes periapical inflammation, the pulp can be opened and drained as soon as possible to remove the infected pulp and promote the discharge of inflammatory secretions. The swelling of the jaw and face can be reduced after 3-5 days. If necessary, incision and drainage can be performed, together with the application of antibiotics, etc., to accelerate the inflammation subsidence.