NasutionA., WardaniatiI. and LestariS. 2022. Antibacterial Activity of Edible Film with the Addition of Betel Leaf Extract (Piper betle) againts Streptococcus mutans. JPK : Jurnal Proteksi Kesehatan. 11, 1 (Jul. 2022), 12-16. DOI:https://doi.org/10.36929/jpk.v11i1.465.