Abstract: Background: Oral hygiene is the practice of keeping the mouth and teeth clean to prevent dental problems, especially dental caries, gingivitis and bad breath. The purpose of maintaining oral hygiene is to prevent the build-up of plaque, the sticky film of bacteria and food that forms on the teeth.1 This research study was conducted to find out the Knowledge and Practice regarding Oral Hygiene among Primary School Children of selected school, Dhangadhi,