Effects of Nanohydroxyapatite and Fluoride varnish on the Microhardness of the Artificially Induced Enamel Lesion: An In-Vitro Study. Mustansiria Dental Journal, [S. l.], v. 21, n. 2, p. 167–177, 2025. DOI: 10.32828/mdj.v21i2.1159. Disponível em: https://mdj.uomustansiriyah.edu.iq/index.php/mdj/article/view/1159. Acesso em: 4 jun. 2026.