Pham, H.M., Nguyen, T.K.H. and Le, P.D. 2022. A combination of near - infrared and fluorescence techniques for detecting early tooth lesions. VNUHCM Journal of Engineering and Technology. 5, 1 (Apr. 2022), 1371-1379. DOI:https://doi.org/https://doi.org/10.32508/stdjet.v5i1.936.