Irrigation is an essential part of root canal treatment because it improves the debridement and disinfection of areas that tools are unable to thoroughly clean. Remote parts of the root canal system are frequently difficult to clean using irrigation that is mostly done with a syringe and a needle. As a result, various more complex techniques have been introduced. Ultrasonic irrigant activation is probably the most widely used adjunct method, and it has been compared with syringe irrigation in multiple studies. However, very few attempts have been made to summarize the available evidence.