Limitations of Thermafil technique: According to the studies of Thermafil technique and in fact our research, there are some limitations of techniques such as: over-obturatingis the only true limitation of Thermafil technology; Thermafil technique tends to extrude materials out of the apex in cases of poor canals preparation (shaping over apex, tapering too large, transportation), excessive amount of sealer, improper viscosity, using a smallerThermafilthan the canals size, pushing the Thermafil too deep, too much gutta - 22 percha flow at the tip of Thermafil, excessive obturationforce and speed.