Heat-treated NiTi mechanized files have shown improved properties compared to non-heat NiTi. They can also be used in more challenging cases, give a better canal shape, be more efficient and have a slightly different feel when using them of heat-treated NiTi mechanized files during endodontic treatment. The presentation It will also include cyclic fatigue, bending and torsional tests comparing heat-treated vs. non-heated treated NiTi mechanized files. Learning metalurgia we can understand how the files performance inside the canal. In this session we will learn how can we work safer and with better results in the shaping procedure.