The Effect of Online Education on the Level of Knowledge of Methodist-2 Kisaran Junior High School Children in Maintaining Oral Hygiene During the Covid-19 Pandemic. AMCR [Internet]. 2021 Nov. 8 [cited 2026 Aug. 19];2(4):189-94. Available from: https://hmpublisher.com/index.php/AMCR/article/view/124