Cleaning and shaping of the root canal system is an essential part of root canal therapy. Traditionally it has been performed by using stainless steel hand files. Due to some undesirable characteristics of stainless steel files, a new generation of endodontics instruments made from Ni-Ti has added a new dimension to the practice of endodontics. This book gives an insight into the methods mode of action of various instruments and problems related to use of various instruments. This book is very useful for both undergraduate and postgraduate students as it gives a clear idea as to which rotary system can be used to achieve best results. It will help the practioner do a successful treatment of endodontically diseased tooth in every aspect.