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Introduction: Diabetes mellitus is a chronic heterogenous disease in which there is dysregulation of carbohydrates, protein and lipid metabolism; leading to elevated blood glucose levels. The present study was conducted to evaluate the correlation between blood glucose and salivary glucose levels in known diabetic patients and control group and also to evaluate salivary glucose level as a diagnostic tool in diabetic patients. Materials and Methods: A total number of 250 patients were studied, out of which 212 formed the study group and 38 formed the control group. Result: Among 250 patients, correlation was evaluated between blood glucose and salivary glucose values which on analysis revealed Pearson correlation of 0.073. The p-value was 0.247, which was statistically non significant. Conclusion: Salivary glucose values cannot be considered as a diagnostic tool for diabetic individuals.