A big bag swollen at the gum of bad tooth may be related to periapical infection, gingivitis, periodontal abscess, pericoronitis of wisdom tooth and other factors. You should go to the hospital in time to find out the specific situation and carry out targeted treatment. 1.Periapical periodontitis: tooth decay, local infection and other factors can cause infection of the tissue around the root tip. Local inflammatory reaction, may lead to bad teeth gums at the swelling of a large bag, after the diagnosis can choose metronidazole, cefoperazone and other drugs for treatment, when the pain is severe, can choose ibuprofen, celecoxib capsules and other drugs for treatment, if necessary, should also consider surgical treatment, such as root canal treatment, apical scraping, etc.; 2, gingivitis: often eat irritating food, or did not do a good job of oral care, also have may cause local infection of the gums, with the aggravation of the infection, there may be bad teeth gums at the swelling of a large bag, can also be accompanied by pain, bad breath and other symptoms. You can use hydrogen peroxide solution for rinsing, as well as antibacterial mouthwash rinse, such as compound chlorhexidine rinse. You can also choose metronidazole, cefixime and other drugs for treatment, and if necessary, consider surgical treatment, such as gingivectomy, gingivoplasty, etc.; 3, periodontal abscess: If you do not pay attention to oral hygiene, or teeth in the occurrence of inflammation is not treated in a timely manner, it can cause periodontal abscess, which can also cause a large swollen bag at the gums of bad teeth. The symptoms are mild and can be treated by warm water rinse and drugs such as metronidazole, erythromycin, etc. When the symptoms are heavy, surgical incision and drainage of abscess treatment is required; 4, wisdom teeth pericoronitis: mainly due to wisdom teeth eruption position, bacterial infection and other factors caused by this local inflammatory reaction, can lead to bad teeth gums swollen a large bag of circumstances, but also accompanied by pain, fever and other symptoms. You can choose hydrogen peroxide solution, saline, etc. for local rinsing, and also antibiotics such as metronidazole and clindamycin for treatment, and if necessary, surgical treatment should be considered, such as wisdom tooth extraction and pericoronal gingival flap removal.