" A Comparative Study to Evaluate Changes of Free Gingiva Adjacent to Extraction Sites During Canines Retraction Using Different Levels of Orthodontic Forces. مجلة الجامعة [Internet]. 2022 Apr. 4 [cited 2026 Jun. 6];4(19). Available from: https://journal.hama-univ.edu.sy/huj/article/view/829