Oral health is defined as a state of the mouth and its associated structures, where there is no disease or pain and able to function well to masticate food and state of teeth which are of a socially acceptable appearance. Aim: To evaluate the prevalence of dental caries among children. Objective: To report about the food habits of children. To evaluate the knowledge, attitude and preventive practices on oral health among children. Study design: This study was done as population based cross – sectional study on the prevalence of dental caries among the children aged between 6–12 years who are attending Kuzhandhai Maruthuvam OPD at National Institute of Siddha from Jun 2018 to August 2018. Sample size: The sample size required for the study was estimated to be 300 participants. Sampling techinique: The children were identified for the study using simple random sampling technique. Consent was obtained from the informant before the commencement of this study. Ethical approval: Ethical clearance was obtained from the institutional Ethics Committee, National Institute of Siddha (NIS/IEC/2018/30,7.5.2018) and CTRI Registration done (CTRI 2018/06/014567) prior to the conduct of the study. Data analysis: Data entry and analysis was done using the stata software. Descriptive statistics was calculated for background variables of 300 children. Result: In the present study DMFT criteria was employed to assess the prevalence of dental caries among children. Therefore, on clinical examination of the oral cavity of the 300 participants, the prevalence of dental caries decayed teeth (n=115), filled teeth (n=40) and missed teeth (n=33). Conclusion : The importance of oral health is maintained, by incorporating practical sessions on appropriate technique and frequency of brushing and cleaning the mouth to the children.