Indumathy M, and Arthi Balasubramaniam. “Association Between Tobacco Dependence and Tooth Loss Among Patient Visiting Private Dental College and Hospital-A Cross-Sectional Study”. International Journal of Research in Pharmaceutical Sciences, vol. 11, no. (SPL 3), Oct. 2020, pp. 583-7, https://ijrps.com/home/article/view/2562.