This book will be dealing with various single file systems used in day today's life.The Single File System is an exciting new concept in the preparation of the root canal.With these single file systems only one file is required to prepare the canal to an adequate size and taper, even in narrow and curved canals. Recent advances for endodontic canal preparation have focused on the concept "Less is More". Thus a single-file technique has developed for shaping the vast majority of canals, regardless of their length, diameter,or curvature.These files only shape the canal, extremely quickly in many instances, but they do not clean the root canal.This book will be covering Self Adjusting File,WaveOne,Reciproc, One Shape, Twisted file,Komet F360,Neo NITI,Unicone, T-One.