Dental caries are reversible dynamic biochemical events, and remain a public health problem due to its characteristics, cost of treatment and effectiveness of quality of life.Dental caries has a highest and longest association with dental profession. Dental caries do not undergo any termination or diminution if untreated and required expertise and professional treatment. But the risk factors should be studied and modified so that dental caries can be prevented. Despite the fact that various successful treatment goals have been developed the disease is still prevalent. In olden days dental caries detection was considered as a boon.To assess the caries risk of 18 to 20 year old patients using cariogram visiting private dental College in Chennai city. A total of 170 patient records taken who visited college from the period of June 2019 to March 2020. Cariogram images taken and analysed individually. Data were tabulated and statistically analysed using SPSS software. Descriptive statistics were expressed by means of frequency and percentage. Chi-square test was used to find the association of cariogram variables with age and gender. Out of 170 samples 32.4% of them were females, 67.6% males. Based on age group 23.5% of them were 18 years, 19 years - 38.8% of age and 37.6% of the population were 20 years of age. The significant association was observed between gender and fluoride, with more usage of fluoride measures by the males when compared to the females.