A demonstration in endodontics was held as part of clinical certificate course in endodontics. The class was taken by Dr. Nitin Singh. The topic of discussion was Biomechanical preparation. Modern techniques for preparing the root canal involve a crown-down approach to more efficiently remove infected debris and to improve access for irrigants. The balanced-force technique, with a 60° clockwise turn followed by a balanced anti-clockwise cutting motion, is accepted as the most efficient method of file manipulation. Copious irrigation with an appropriate antiseptic material is essential to clean the root canal system following shaping of the main canals. The smear layer should be removed with an EDTA solution before placing an intervisit dressing, or carrying out obturation.