According to a survey conducted by the Chinese Medical Association Diabetic Society, the total incidence of oral disorders in diabetic patients is 83.37%, which is 2-3 times higher than that of non-diabetic patients. The world medical community also agrees that periodontal disease and diabetes do have a two-way relationship, and some foreign scholars even regard periodontal disease as the sixth complication of diabetes. Studies have proven that diabetes is one of the risk factors for developing periodontal disease. The persistent hyperglycemic state of diabetic patients provides abundant nutrients to the bacteria in their gums, causing microvascular obstruction in the gum tissue and thus predisposing them to oral infections. Coupled with the poor tissue repair ability of diabetic patients, once they suffer from periodontitis, it tends to be more serious and prone to symptoms such as periodontal abscesses. Conversely, periodontal disease can also affect the internal metabolism of diabetic patients. Because periodontal disease often affects multiple teeth and has a large area of infection, a person with severe periodontitis has the equivalent of a 20 cm long chronic wound in the mouth, from which hundreds of millions of bacteria can enter the bloodstream and thus affect the whole body. In addition, the anaerobic bacteria that cause periodontal disease also reduce the cellular control of insulin, resulting in blood sugar levels that are not easily controlled. Therefore, if periodontal disease is effectively treated, the amount of insulin needed to control the blood sugar of the patient’s body will be reduced. Therefore, diabetic patients should pay particular attention to oral health care, and should have regular oral examinations for early detection and treatment, as well as ensuring effective brushing twice a day and using mouthwash when necessary to remove the bacteria in the mouth.