Background: Prevalence of deleterious oral habits in children. Materials & methods: A total of 100 subjects were enrolled. The age of subjects was 10 to 12 years. Out of total, 60 were males and 40 were females. Clinical examination was done. Children were examined using mouth mirror and straight probe. The results were evaluated using the SPSS software. Results: The result showed that 22% children had a habit of tongue thrusting, 15% mouth breathing and 5% nail biting. Conclusion: Tongue thrusting is the most prevalent oral habit among children. Keywords: Prevalence, Tongue thrusting, Children.