Expect the unexpected

A clinician must be familiar with the expected and unexpected root canal morphology that might be encountered during treatment. It plays the most significant role in determining the prognosis of the endodontically treated tooth. This article presents two cases reports of the endodontic treatment of upper first molar and retreatment of mandibular second premolar with a variable root canal anatomy.
Key words: molar, premolar, variation, morphology
Conflicts of interest. The authors have no conflicts of interest to declare.
Funding. There was no funding for this study