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The ultimate goal of root canal treatment is to clean, shape, and disinfect all root canals in a tooth. The presence of missed canal/root that is not fully treated might increase the risk of failure of root canal treatment, as pulpal pathology is not completely eradicated. In the present case report, we describe the successful diagnosis and management of an incidental finding of a third root in the maxillary second premolar. Such finding has been described to be of relatively low incidence in literature. The successful diagnosis of comparable cases may require adjuncts to routine radiography.