Background: Oral hygiene is the practice of keeping your mouth clean and disease-free. It involves brushing and flossing your teeth as well as visiting your dentist regularly for dental X-rays, exams and cleanings. Oral health is also linked to whole-body health. For example, if an infection is present in your mouth, your bloodstream can carry the bacteria to other areas of your body, leading to other health concerns like heart disease and stroke. Keeping your teeth and gums healthy is an important part of long-lasting overall health. The present study was pre-experimental research design. The study was conducted on 60 school going children aged among (6-12years) studying at selected school of Naraingarh, in District Ambala, Haryana recruited using non probability convenient sampling technique. Data was collected by using validated socio-demographic variables and knowledge questionnaire. Result shows that knowledge of students has improved by information booklet and teaching programme regarding oral hygiene practices among school children. In pre-test 93.3% of sample was having average knowledge and 6.7% of sample was having poor knowledge regarding oral hygiene practices. There was a significant improvement in post-test knowledge. 88.3% of the sample was having good knowledge and 11.7% of the sample was having average knowledge regarding oral hygiene practices among school children.