Mostly mandibular first molar has two roots, mesial and distal whereas there may be an additional root present either buccally (radix paramolaris) or lingually (radix entomolaris). For the success of treatment outcome it is important to understand accurate root canal anatomy. Aim of this paper is to illustrate case of permanent mandibular first molar with an additional third root named as radix entomolaris. Misdiagnosed additional third root in mandibular first molars may affect the prognosis of tooth. Proper diagnosis and visualization of variation in root canal anatomy is important for treatment success.
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