Engine instruments is important in modern endodontics. They provide efficiency, precision, and safety during root canal procedures. These rotary and reciporcating instruments help in cleaning and shaping the root canal system while minimizing the risk of procedural errors. Reciprocating systems reduce the risk of instrument fracture by alternating movement directions, enhancing efficiency and safety. Gates Glidden drills and Peeso reamers assist in coronal shaping and post-space preparation. Using the right engine instruments with proper torque and speed settings ensures predictable canal shaping, reducing chair time and improving treatment outcomes. Regular maintenance and correct handling of these instruments help extend their lifespan and ensure consistent performance in endodontic practice.