Background: Periodontitis is more prevalent in diabetic patients which can worsen diabetes. Periodontal disease alters the glycemic status in diabetic patients. In non diabetic adults periodontitis results in impaired glucose tolerance which is a prediabetic state and they are at a higher risk of developing diabetes. Aim: To examine the association between periodontitis and impaired glucose tolerance (IGT) using oral glucose tolerance test in adult non diabetes patients. Materials and methods: A total of 50 healthy non diabetic subjects were recruited into the study from Dept of Periodontics, SRM Dental College __ampersandsignamp; Hospital, Ramapuram Chennai, India. The study population comprised of 25 control group without periodontitis and 25 study group with periodontitis. Clinical periodontal parameters such as probing depth, attachment loss, gingival index and body mass index was assessed for all patients. Metabolic status was determined by 2 hour oral glucose tolerance test. The relationship between mean probing depth, mean attachment loss, gingival index with impaired glucose tolerance were analysed. Results: The proportion of subjects with IGT increased significantly in the subjects with higher GI, Mean PD, Mean CAL ( P__ampersandsignlt;0.0001). Discussion: In this cross sectional analysis, periodontal pockets, clinical attachment levels, gingival index were significantly associated with IGT. Periodontal pathogens in deep pockets, and periodontal inflammation causes the release of pro inflammatory cytokines mainly TNF-__ampersandsignalpha; which causes insulin sensitivity. The results of the study were consistent with reports of Loesche et al 2000, Saito et al 2006,Nibali et al 2007, Ryan et al 2009. Conclusion: Deep pockets, clinical attachment loss, gingival index were significantly associated with IGT, suggesting that periodontitis is associated with elevated blood glucose levels in adults without diabetes and may increase one__ampersandsignrsquo;s risk for Type 2 diabetes.