In my opinion, an extremely important step in root canal treatment is root canal irrigation. Cleaning the inside of the root canal is a more difficult procedure than the dentist may think and, in practice, often results in inadequate cleaning. Root canal irrigation is not as simple as simply placing fluid into the root canal. As the name "irrigation" implies, it is the act of physically and chemically removing the dirt inside the root canal using a cleaning solution - some kind of liquid. The root apex is the most important area of the root canal where cleaning is required. In root canal treatment, aseptic preparation of the root canal by the dentist can prevent apical periodontitis. Once the root canal has been ideally enlarged with a NiTi file, it must then be thoroughly cleaned; if there is debris, it should be physically flushed out, and if there is inorganic or organic residue, it must be chemically cleaned. In addition, the root canal must be perforated and patency mus