Saliva is a unique fluid which plays an important role in maintaining the normal oral health of an individual. Diabetes is the major factor that leads to the changes in the salivary pH, salivary flow and dental caries. 32 articles were collected from the pubmed website and were included as citations in our present review. Salivary glucose and blood glucose level are directly proportional to each other. Normal level of salivary glucose is 0.5-1.00 mg/ml. Salivary hypofunction in diabetic individuals is observed. Diabetes leads to the reduction of salivary pPH and salivary flow. It also helps in multiplication of harmful microorganisms in the oral cavity.