Afzal, Sana, Ahsan Mahmood Shah, Tariq Ali Khan, Farhana Afzal, and Saira Bano. 2017. “Oral Hygiene Status of Orthodontic Patients Using Hyrax Expander”. Pakistan Orthodontic Journal 8 (2):80-84. https://poj.org.pk/index.php/poj/article/view/142.