Type 2 diabetes mellitus is a chronic metabolic disorder in which prevalence has been increasing steadily all over the world. Diabetes has many oral complications such as caries, periodontal diseases, salivary disfunction, calculus in salivary glands, oral candidiasis, and mucosal lesions. During dental and oral surgical treatment, dental professionals should take care of special considerations in order to avoid hypoglycemia and promote appropriate wound healing.