FACTORS ASSOCIATED WITH THE DEMAND FOR SMILE IMPROVEMENT AMONG YOUTH AGED 16-18 YEARS IN TU SON CITY, BAC NINH PROVINCE, VIETNAM IN 2026. YHCĐ [Internet]. 2026 Nov. 6 [cited 2026 Nov. 8];67(CD16). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/7005