Bad gums can be caused by food inlays, gingivitis, and localized injuries. It can be treated by keeping the mouth clean, scaling or using medicines such as cotrimoxazole rinse and amoxicillin capsules. 1. Food inlays: Food inlays are easily caused by large gaps between teeth or denture edges that do not fit together. If you don’t pay attention to cleaning for a long time, it will lead to swelling and pain, so the gums are bad. You need to keep your mouth clean and develop a good habit of rinsing your mouth after meals and brushing your teeth in the morning and evening. 2. Gingivitis: due to poor oral hygiene, cleaning is not complete, resulting in plaque calculus accumulation, the formation of oral inflammation, the symptoms of swollen and painful gums, you can go to the stomatology department for scaling, or the use of compound chlorhexidine gargle and other drugs for treatment. 3. Localized injury: bad gums can be caused by frequent consumption of too hard, too hot food or incorrect brushing methods, which may lead to mucosal damage to the gums. You can use amoxicillin capsules and other drugs for treatment as prescribed by the doctor, and you should change the way of brushing your teeth, eat a light diet, and avoid eating stimulating cold food. It is recommended to pay attention to the maintenance of oral hygiene, gums have symptoms of discomfort, should be timely to the hospital, follow the doctor’s instructions standardized treatment.