Background: WHO suggests that caries prevalence done in age group 15 years would be more meaningful than 12 years age. At present there are such studies in age group of 15-17 years conducted in Calicut district. 3200 students from Government higher secondary schools in Calicut district were examined to evaluate the association of caries with respect to age, gender, dietary habits and location. All the data were entered in SPSS (18) software. Chi-square test was used to compare socio-demographic characteristics and risk factors. The level of statistical significance was be set at p<0.05. The overall prevalence of dental caries was found to be 66.13%. The prevalence rate was statistically significant when gender was considered. Caries prevalence was slightly more in rural 67% when compared to urban 65%. The association of caries and habits was not statistically significant. In the sample studied it was seen that 38.8% of the students did not need any treatment, whereas 5.28% needed two surface restoration, 55.8% required one surface restoration, 7.44% required RCT, 7.44% required crown,6.44 required extraction, 42.84% required oral prophylaxis,6.28% required bridge and 1.38% required other treatment procedures like orthodontic procedures.