A study to assess the effectiveness of video-assisted teaching cum demonstration on oral health among school children in selected school at kanyakumari district. The objectives of the study were to assess the knowledge and practice regarding Oral Health among school children. To determine the effectiveness of Video Assisted Teaching cum demonstration among school children. To find out the association between the level of knowledge with their selected demographic variables through post- test. Pre experimental one group pre-test, post-test design was adopted for this study. The conceptual framework was based on Pender”s modified Health Promotion Model. The study was conducted in Don Bosco matriculation school midalakadu, kanyakumari. Non probability purposive sampling technique was adopted to select the desired sample. The sample size was 60 children respectively. Structured interview questionnaire was used to assess the knowledge and practice regarding oral health among school children. The data collection tool was validated by experts and was found to be valid. The group was shown videos and demonstrated the steps of brushing and flossing. The result revealed that “t” value was 9.31, it was significant at p<0.05 level. Hence the stated hypotheses H1 were accepted. It is inferred that video assisted teaching cum demonstration is effective in improving oral health knowledge and practice among school children.