Sari, Rezmelia, et al. “Chitosan Gingival Mask Based on Guava Leaf Extract To Prevent Smoker’s Melanosis ”. Interdental Jurnal Kedokteran Gigi (IJKG), vol. 22, no. 2, Aug. 2026, pp. 371-8, doi:10.46862/interdental.v22i2.12411.