Dry gums may be caused by tooth decay, gingivitis, periodontal disease, etc. It is recommended to consult a doctor in time to clarify the cause. 1. Tooth decay: tooth decay is a chronic bacterial, progressive destructive lesion of the hard tissues of the teeth. Tooth decay is a common and frequent disease in human beings, which is related to oral environment, diet, host’s own factors and time factors. It can cause toothache, tooth sensitivity, swollen gums, change in tooth appearance, dry gums and other symptoms. 2. Gingivitis: Gingivitis refers to inflammation of the gum tissue caused by plaque and other factors, and is a common gum disease. It often manifests itself as bleeding gums when brushing teeth or biting hard objects, accompanied by changes in the color, shape and texture of the gums, dryness of the gums and other symptoms. 3. Periodontal disease: periodontal disease is a common dental oral disease, periodontal disease can be divided into gum disease and periodontitis. Often manifested as red, swollen, painful, pus-flowing gums, tooth sensitivity, dry gums and so on. In addition to localized oral infections, arthritis, nephritis, endocarditis and other systemic diseases may also lead to periodontal disease. If you feel unwell, you should go to the hospital in time, so as not to delay the condition or cause adverse reactions.