This document reports a rare case of gemination (incomplete division) of a mandibular third molar. A 30-year-old female presented with pain in her lower right back tooth region. Radiographs revealed a partially erupted anomalous tooth with two crowns fused to a single bulbous root. The tooth was surgically extracted and found to have a single root and incomplete division, confirming a diagnosis of gemination. Gemination and fusion are uncommon developmental anomalies that can impact tooth alignment and other dental treatments if not properly diagnosed and managed. This case highlights the importance of accurate radiographic evaluation and diagnosis of such dental variations.