A novel irrigation instrument, the XP-endo Finisher, has been introduced by FKG, Dentaire SA (La Chaux-de-Fonds, Switzerland). This instrument’s design is similar to an ISO size #25, 0.00 taper NiTi file. According to manufactures, this file improves the penetration of irrigation solutions to the irregular area of root canal system by expanding its reach 6 mm in diameter3,29.