An upper first molar usually has three root and 3 to 4 canals, however, this case present here, tooth 26 only has two roots. The pre-operative periapical radiograph suggested that a mesiobuccal canal may be present in the buccal root because the canal was not in the centre of the root. Hence, the patient was sent to me for retreatment, although the tooth was asymtomatic. Under excellent magnification and illumination from the operating microscope, the MB canal was located. Buccal canal bifurcated into MB and DB canals at the apical one third. Canals were filled with the warm vertical technique.
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