AUTHOR=Duangthip Duangporn , Chu Chun Hung TITLE=Challenges in Oral Hygiene and Oral Health Policy JOURNAL=Frontiers in Oral Health VOLUME=1 YEAR=2020 URL=https://www.frontiersin.org/journals/oral-health/articles/10.3389/froh.2020.575428 DOI=10.3389/froh.2020.575428 ISSN=2673-4842