Annisa, Y. and Cahyaningrum, S. 2022. Toothpaste Gel Preparation from Composite of Hydroxyapatite-Chitosan-Green Betel Leaf (Piper Batle L.) Extract. Indonesian Journal of Chemical Science. 11, 2 (Aug. 2022), 114-122. DOI:https://doi.org/10.15294/ijcs.v11i2.54583.