Treatment of fused teeth needs special care and attention to the bizarre anatomy. This paper describes root canal treatment of a fused carious tooth presenting with apical periodontitis. It is a rare case of fusion of the mandibular second molar with a paramolar. https://www.spidertattooz.com/Creative-Grids-Quick-Trim-And-Circle-Ruler-Two-4-1-2in-x-24-1-2in-CGRMT5/