H. . Endrowahyudi, A. . Rahaju, and M. . Margareta Dian Puspita, “THE EFFECTIVENESS OF BAKING SODA (Sodium Bicarbonate) 20%, 40%, AND 60% ON TEETH THAT HAVE COFFEE STAIN”, JHDS, vol. 2, no. 3, pp. 467–478, Jan. 2023.