A retreatment of the canal or orthograde preparation aims to completely remove the existing filling material, reach areas that were left untreated during a previous procedure, and thus ensure complete disinfection of the root portion. With the NiTi Endo ReStart file system, this task can be performed effectively yet controlled in just a few steps. The Endo ReStart Opener has a constant taper of 10%, a diameter of 0.30 mm, a length of 15 mm, a short active part of 5 mm, a tip with 4 surfaces, is sterile, and reusable. The Endo ReStart Files have a constant taper of 5%, a diameter of 0.25 mm, a length of 25 mm, a tip with 2 surfaces, are sterile, and for single use. 2x RE10L15.204.030, 4x RE05L25.204.025.