Swollen gums and painful mouth ulcers may be due to problems such as gingivitis and periodontitis. 1. Gingivitis: generally due to plaque on the surface of the teeth caused by non-specific inflammation of the soft tissues of the gums, manifested as bleeding gums, bad breath, loose gums, gums, dark red gums, swollen and painful gums, mouth ulcers and other symptoms, you can use hydrogen peroxide solution, chlorhexidine, iodine and other medications for treatment. 2. Periodontitis: generally refers to the inflammation of the gums further to the deeper periodontal tissues and the formation of the periodontal pockets overflowing pus, gums red and swollen, loose teeth, chewing weakness, swollen and painful gums, mouth ulcers and other symptoms, you can use metronidazole, amoxicillin, cloxacillin gargle and other medications for treatment. Swollen gums and mouth ulcers may cause micronutrient deficiencies and other serious symptoms, you need to go to the hospital as soon as possible to confirm the diagnosis, under the guidance of the doctor’s instructions to use drugs, standardized treatment.