Aim: This study was conducted to assess and evaluate the knowledge, attitude, and practice among 9–13 years old day scholars and residential schoolchildren in South Bengaluru, Karnataka. Materials and methods: A total of 2,155 schoolchildren aged between 9 years and 13 years from 13 schools in South Bengaluru participated in the study out of which 1,039 were residential schools and 1,116 were day scholars. All children were given 36 close-ended questionnaires pertaining to knowledge attitude, diet, practice, and behavior regarding oral health and were requested to complete them within 15 to 20 minutes on the school premises only. Results: The results of our study showed about 89.2% of the participants had good knowledge about maintaining healthy and good teeth for their good health. Also, 75.7% of children knew that sugar is the cause of tooth decay, 94% of the study participants had good oral hygiene practice, but the awareness regarding other oral hygiene aids (flossing) was found to be 11%. Conclusion: Results of our study showed general awareness of oral health was quite good and children had a positive attitude toward oral hygiene practices but exhibited limited knowledge on the preventive dental practices. This suggests the need for implementation of the importance of the early preventive dental visit, through effective oral health promotion through school dental health programs. Clinical significance: Good oral hygiene keeps teeth free from dental plaque buildup, fights off cavities, and bad breath. A healthy diet that is low in sugary foods, regular dental visits, oral hygiene instructions provided by the dentist is an essential part of the maintenance of good oral hygiene. Based on the study, we recommend establishing oral health programs under school health that addresses oral health promotion and awareness of dental diseases.