Introduction: Diabetes Mellitus and Periodontitis have a bidirectional relationship, each exacerbating the other’s complications. Periodontal disease is considered as the ‘sixth’ complication of diabetes. The adverse relationship between the two diseases is bidirectional. Raising awareness about oral hygiene and treating periodontal issues are essential to mitigate diabetes-related complications and improve overall oral health. Methods: In a descriptive cross-sectional study among a total of 403 diabetic patients visiting out-patient department of Internal Medicine at BP Koirala Institute of Health Sciences, a questionnaire was used to assess awareness of periodontal health among diabetic patients. Results: The results indicated that the general public is less aware of the increased risk of oral diseases in diabetes. Only a minority of the respondents, 127 (31.43%), were aware of the link between poor oral health and the development of disease. 178 (44.05%) believed that diabetic patients are more likely to have swollen/tender gums, and 89 (22.02%) believed that diabetics are more prone to developing fungal infections in their mouth. Furthermore, only 70 (17.32%) of the respondents thought that diabetic patients have gum problems more often if their blood sugar remains high and only 76 (18.81%) believed that gum disease can negatively affect blood sugar control in diabetic patients. Conclusion: These data reveal a lack of knowledge about the oral manifestation of Diabetes Mellitus. Health professionals in dentistry and medicine must collaborate on educational programs to raise awareness about these oral manifestations, aiming to improve oral health and reduce the risk of oral diseases effectively.