This study will evaluate a method to screen for gum disease (periodontitis) among diabetic patients in a medical setting. 200 diabetic patients at the Queen Elizabeth Hospital will complete a questionnaire and dental radiographs will be taken. A standardised oral epidemiological examination will be conducted to provide a ‘gold-standard’ designation of periodontitis. A statistical formula will combine questionnaire and radiographic data, and its accuracy in predicting gold-standard periodontitis will be measured. If successful, the study would provide the justification for a trial in which periodontal care would be tested for its impact on dental and medical management of diabetics.