Permanent mandibular third molars are known to have two distinct mesial and distal morphological roots. However, there might be some discrepancies in their roots number. An additional root located mesiobuccally is called radix paramolaris (RP) while the distolingually placed one is called radix entomolaris (RE). Worldwide, RE is more common than RP. The pathogenesis of the third root occurrence in the mandibular molar is still hazy. Unawareness of the number, position, and morphology of the roots of mandibular third molars might greatly impact the extraction of this tooth which could result in serious surgical morbidity. Therefore, the aim of this paper is to present a rare case of a Nigerian patient with three rooted mandibular third molar.