Mohamed Abdelsalam, Abubakr Omar, and Ibrahim Ahmed Ghandour. “Prevalence of Chronic Gingivitis Among 16 Years Old Public High School Students in Khartoum”. Med Phoenix 3, no. 1 (August 15, 2018): 1–5. Accessed July 5, 2024. https://nepjol.info/index.php/medphoenix/article/view/20754.