Endodontic instruments such as file or reamer has potential risk to breakage during cleaning and shaping procedure especially in curved canals. In this case the instrument was fractured because it was forced into the dentin walls to gain deeper penetration, and its removal result in breakage. In this case report removal of the instrument fragment in root canal with conventional technique was failed. So it was decided to continue the treatment, with the consideration that there is no complain within one month observation.