Shojaeian, Shiva, Nazanin Zargar, and Maryam Amiri. “Effect of Internal Bleaching on Discoloration Caused by 4 Different Materials: Internal Bleaching”. Journal of Dental School 41, no. 2 (January 21, 2024): 75–81. Accessed July 8, 2026. https://journals.sbmu.ac.ir/dentistry/article/view/43148.