This case report describes an unusual morphology of seven root canals in maxillary first molar tooth. The maxillary right first molar of a young male patient was treated endodontically, the second visit, the seven canals (MB1, MB2 and MB3, 2 Palatal and DB1 and DB2) was easily identified at high magnification under an operating microscope. The canals were then instrumented and obturated. It should be acknowledged that all molar teeth have more than the traditionally expected three canals. The location of root canals should be identified at high magnification under the microscope. Careful radiographic re-examination of the fillings should be done in order to identify possibly missed canals.