Purba, M. R., Tarigan, G. C. . ., & Lokanata, S. (2025). The effectiveness of natural tooth whitening using herbal substances on coffee-induced tooth discoloration. Buletin Kedokteran & Kesehatan Prima, 4(1), 177-182. https://doi.org/10.34012/bkkp.v4i1.6793