- N1 – For Coronal one-third
- N2 – For the Middle one-third
- N3 – For Apical one-third
N1 and N2 come in 16mm and 18mm and N3 comes in 22mm and 25mm. Retreatment Files are used with a gentle touch, the files are never forced, and always the recommended speed and torque setting are used. The file is used in a circumferential filing motion. The files are always cleaned in – between and inspected for any deformation. It is used until all the gutta-percha is removed from the canal