Some studies have shown that diabetes and oral diseases have a bidirectional relationship that affects each other. 1. The impact of diabetes on oral diseases: diabetes can cause or aggravate periodontal disease, oral mucosal lesions, dental caries, alveolar bone resorption, loose teeth, jaw and peri-mandibular infections and other oral diseases. 2. The impact of oral diseases on diabetes: Oral diseases are important risk factors for the development of type 2 diabetes and gestational diabetes, and have a negative impact on the metabolic control of diabetes. Managing oral diseases is beneficial to the control of diabetes. When diabetic patients suffer from oral diseases, it is recommended that they seek timely medical treatment to avoid delays and adverse consequences.