Irianti, A.N., Kuswandari, S. and Santoso, A.S. 2021. Effect of formula milk on the roughness and hardness of tooth enamel. Dental Journal. 54, 2 (Jun. 2021), 78–81. DOI:https://doi.org/10.20473/j.djmkg.v54.i2.p78-81.