Nababan, I., Molek, and Sharon Altin Taqwani. “The Relationship Between Self-Confidence and Teeth Stain Caused by Coffee Consumption and Smoking on Dentistry Student of Universitas Prima Indonesia”. Community Medicine and Education Journal, Vol. 5, no. 1, Nov. 2023, pp. 387-91, doi:10.37275/cmej.v5i1.423.