D Diabetes mellitus is a metabolic disorder in which the body does not produce or properly distribute the insulin. This insufficient production of insulin will keep glucose in blood, thus increasing glucose blood level. Furthermore, instead of using glucose to create energy, insufficient insulin stimulates the break down of lipid and protein as compensation, leading to the microvascular disease (damage to small vesels). This condition gives diabetes patients their characteristics: pol}uria, polydipsia and polyphagia. Oral manifestations in diabetes are gingivitis, periodontal disease, salivary gland dysfunction, oral candidiasis, infections, caries, periapical abcesses, loss of teeth , taste impairment and lichen planus. Hypoglycemia is the main hazard which can happen during dental treatment. It usually arises because the patient has acutely decreased calories intake, an infection, or an increaced metabolic rate by marked anxiety.To prevent hypoglycemia, a dentist can test blood glucose level of the patient with a glucometer and administer oral glucose just before the appointment. It is advisable to give patient early morning appointments so that they are not kept waiting. In addition, it is also recommended for dentist to use anesthetic that contains epinephrine and provides any form of glucose while taking care of diabetic patient. All kind of dental treatment given to diabetic patient should be delivered vef) carefully due to condition of immunocomprimised and delayed wound healing. The dentist must consult with the patient's physician and nutrisionist to discuss any modification to the dental treatment plan. Dentist should refer to an oral surgeon if there is any patient who has poorly controlled diabetes especically those who need surgical procedures.