Nanocrystalline Toothpaste Formulation of Usnic Acid and Antibacterial Activity Test Against Streptococcus Mutans. JPK : Jurnal Proteksi Kesehatan, [S. l.], v. 12, n. 1, p. 70–76, 2023. DOI: 10.36929/jpk.v12i1.677. Disponível em: https://jurnal.pkr.ac.id/JPK/article/view/677. Acesso em: 18 jan. 2026.