REMINERALIZATION EFFICACY OF 1450 PPM SODIUM FLUORIDE ON A GROUP OF EARLY-STAGE CARIOUS PERMANENT TEETH IN CHILDREN AGED 6-15 YEARS ON NGOC VUNG ISLAND QUANG NINH PROVINCE IN 2025. YHCĐ [Internet]. 2026 May 25 [cited 2026 Sept. 8];67(5). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/5179