INTRODUCTIONThe maxillary first molar is one of the most commonly treated teeth in endodontic due to its complex anatomy, which has intrigued clinicians for a long time. The primary goal of endodontic therapy is the accurate identification, thorough cleaning and shaping, and three-dimensional obturation of the entire root canal system.(1) Failure to detect additional roots or canals can lead to endodontic treatment failure.(2)Typically, maxillary molars are described as having three roots and three canals, with one canal in each root. However, studies have shown considerable variation in the number and configuration of root canals in these teeth. The occurrence of a third canal in the mesiobuccal root (MB3) of the maxillary first molar is rare, with a reported incidence ranging from 1.1% to 1.6%.(3,4) Similarly, the presence of a second canal in the distobuccal root (DB2) has been reported in 1.7% of cases.(5)This clinical report presents a rare case of a maxillary first molar with six root canals. Successful identification and treatment of all root canals in this patient were confirmed through the use of 20-degree horizontally angulated radiographs, aided by magnification with loupes.