“The Effect of 30% at-Home Bleaching on Surface Hardness of Esthetic Restorative Materials”. Mustansiria Dental Journal 7, no. 2 (March 19, 2018): 166–173. Accessed April 21, 2025. https://mdj.uomustansiriyah.edu.iq/index.php/mdj/article/view/394.