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Introduction: Oral health is a mirror of overall health. The maintenance of oral health of children with intellectual and developmental disability is a challenging problem due to lack of communicative skills and access to dental care.

Objective: To determine the impact of oral health education intervention on the plaque score among students with intellectual and developmental disability.

Materials and Method: An analytical cross-sectional study was conducted at Gograha Higher Secondary School, Biratnagar after obtaining ethical clearance from the institutional review committee of Nobel Medical College. Convenience sampling technique was utilised for data collection from 2019 January to February. A total of 75 intellectual and developmental disability individuals (55 males and 20 females) with the age ranging from 14-20 years were included in the study. Prior consent to the study was obtained from respective school authority and verbal informed consent was obtained from the participating students and their guardians. Information regarding oral hygiene practices was gathered through personal interaction by the interviewers. Oral hygiene status was assessed by using Silness and Loe Plaque Index.

Results: All the questions showed statistically significant improvement in knowledge and self-reported behaviour. Paired t-test was used, P

Conclusion: Oral health educational intervention was effective in reducing plaque score among the participating students with intellectual and developmental disability.

Oral health education; plaque; tooth brushing.