Khan, M. K., Bokhari, S. A. H., Haleem, A., Kareem, A., Khan, A. A., Hosein, T., & Khan, M. U. (2014). Extrinsic stain removal with a toothpowder: A randomized controlled trial. International Journal of Health Sciences, 8(3). Retrieved from https://pub.qu.edu.sa/index.php/journal/article/view/828