The relationship between diabetes mellitus and periodontal disease is not clear, even though studied intensively. From the available data, it seemed reasonable to believe that diabetics were more susceptible to periodontal disease than non.diabetics.Aim:The present study was to clinically evaluate the relationship of diabetes mellitus with periodontal disease along with various parameters.Materials and Methods:Fifteen hundred patients with diabetes mellitus were examined. A thorough oral examination was carried out and relevant history was recorded for all the patients.Results:Results indicated that the prevalence of periodontal disease in diabetic patients was 86.8%.Conclusion:It can be concluded that poorer the glycemic control, and longer the duration of diabetes, the greater will be the prevalence and severity of periodontal disease.