Results: The prevalence of OMLs was significantly higher among diabetic patients (45.5%) than among control subjects (38.4%) (P = 0.042). Patients with diabetes had a higher prevalence of geographic tongue (GT) (P = 0.017), denture stomatitis (P = 0.018), and angular cheilitis (P = 0.006) than controls. Overall, diabetic patients with poor metabolic control had a significantly higher prevalence of OMLs and xerostomia than patients with moderately and well-controlled disease (P < 0.05).