A fungal infection in the mouth (oral candidiasis) appears to occur more frequently among persons with diabetes including those who wear dentures. Your dentist may prescribe antifungal medications to treat this condition. Good oral hygiene is critical. Lichen planus is a skin disorder that produces lesions in the mouth. A more severe type of Lichen planus involves painful ulcers that erode surface tissue. Although there is no permanent cure, your dentist may prescribe a topical anesthetic or other medication to reduce and relieve the condition. Some diabetics have reported that their taste for sweets is diminished, although the taste impairment is usually not severe. Altered taste sensations, barely perceptible to most diabetic patients, may influence their food choices in favor of sweet tasting foods with highly refined carbohydrate content. This may worsen the diabetic patient's dental health and overall health.