Gum swelling and pain in children’s grown-up teeth may be caused by gingivitis, periapical periodontitis and other diseases, which need to be treated with medication and surgery according to the cause of the disease. 1. Gingivitis: typical symptoms include swollen and painful gums, bleeding gums and so on. If the symptoms are serious, it is necessary to use 1%~3% hydrogen peroxide solution, 0.12%~0.2% chlorhexidine and other antibacterial rinses as prescribed by the doctor. 2. Apical periodontitis: the main symptoms are swollen gums, pain and so on. In the acute stage, it is necessary to use ceftriaxone, amoxicillin and other antibiotics as prescribed by the doctor, and in severe cases, use ibuprofen, acetaminophen and other non-steroidal anti-inflammatory drugs as prescribed by the doctor. If an abscess is already present, incision and drainage or open medullary drainage is required. After the inflammation subsides, root canal therapy or pulpal revascularization may be necessary. When children grow up with swollen and painful gums, they need to go to the hospital in time and cooperate with the doctor to actively treat the primary disease.