COMPARATIVE STUDY OF THE EFFECTIVENESS OF LEAFLET AND BOOKLET EDUCATIONAL MEDIA ON ORAL HYGIENE KNOWLEDGE AMONG FOURTH AND FIFTH GRADE STUDENTS AT SDN 03 TUMPUK TANGAH  SAWAHLUNTO CITY. Proceedings OPTIMAL, [S. l.], v. 2, n. 2, 2025. DOI: 10.5281/69758t52. Disponível em: https://proceedings.nuansafajarcemerlang.com/index.php/ico/article/view/169. Acesso em: 12 feb. 2026.