Mandibular first premolar with two roots and three canals

This case report presents a relatively uncommon clinical case of a mandibular premolar with two roots and three canals. The possibility of additional root canals should be considered even in teeth with a low frequency of abnormal root canal anatomy. Sound knowledge of root canal anatomy, appropriate assessment of the pulp chamber floor, critical interpretation of radiographs and high‐magnification examinations are highly desirable to achieve the best possible outcome in complicated root canal therapy.