Healthy children are successful learners. School age children represent about 25% of total population. Proper brushing is essential for cleaning teeth and gums effectively. Proper way of brushing techniques used to prevent dental caries in school children. The study was carried out in selected school of Chennai. Sample sizes of 30 were selected by simple random techniques. A questionnaire was prepared comprising set of 20 questions covering the objectives. The concluded that in pre test, a majority of 26 (86.6%) had inadequate knowledge, 4 (13.3%) had moderately adequate knowledge, 0% had adequate knowledge. In post test majority of them 23 (76.7%) had adequate knowledge, 7 (23.3%) had moderately adequate knowledge, 0% had inadequate knowledge.