Al-Huwaizi, H.F. and Mutlag, L.S. 2025. The prevalence of undetected second distal canals in endodontic-treated mandibular first molars: A histological and cone beam computed tomography study. Iraqi Journal of Science. 66, 9 (Sep. 2025), 3737–3745. DOI:https://doi.org/10.24996/ijs.2025.66.9.20.