Yuanita, T., Setyabudi, S. and Adjani, Q. S. (2020) “The effect of theobromine and NaF 2% exposure to enamel surface hardness after immersing in orange juice beverage”, Conservative Dentistry Journal, 9(2), pp. 70–73. doi: 10.20473/cdj.v9i2.2019.70-73.