Background: Dental caries is prone to occur on mixed dentition period children age 9-10 years old. Education media lesson schedule SOGI is used to improve oral health status on student age 9-10 years old in SD Negeri Ngebel Gede I Sleman Yogyakarta. Objective: To know the difference plaque index before and after dental health education using media lesson schedule SOGI on students age 9-10 years in SD Negeri Ngebel Gede I Sleman Yogyakarta. Research methods: This research is quasi experimental with pretest and posttest group design. The samples on this research are 37 students on SD Negeri Ngebel Gede I Sleman Yogyakarta determined by purposive sampling. The results analyzed using paired samples t test. Research results: The results obtained significance value 0.000 (p < 0.05) which means there is a significant difference plaque index before and after dental health educational media of lesson schedule SOGI. Conclusion: There are differences plaque index before and after of oral health education using media lesson schedule SOGI on students ages 9-10 years in SD Negeri Ngebel Gede I Sleman Yogyakarta.