Khan, Muhammad Khalil, Syed Akhtar Hussain Bokhari, Abdul Haleem, Abdul Kareem, Ayyaz Ali Khan, Tasleem Hosein, and Muhammad Usama Khan. 2014. “Extrinsic Stain Removal With a Toothpowder: A Randomized Controlled Trial”. International Journal of Health Sciences 8 (3). https://pub.qu.edu.sa/index.php/journal/article/view/828.