Herlinawati 2020. The effectiveness of education through videos and lectures about brushing teeth against plaque accumulation in elementary school students in medan sunggal sub-district. International Journal of Allied Medical Sciences and Clinical Research. 8, 2 (Aug. 2020), 155–163. DOI:https://doi.org/10.61096/ijamscr.v8.iss2.2020.155-163.