A tooth after endodontic treatment, in addition to the fact that it does not respond to thermal stimulation (hot or cold food), is a fully functional tooth. An important issue in its strength is the correct reconstruction of the crown, conservatively (filling) or prosthetically (crown), which guarantees its resistance to occlusal forces. Studies show that a tooth treated canalically becomes more brittle and vulnerable to fractures than the living teeth. However, if it is not overly loaded (eg in the case of numerous missing teeth) and with proper hygiene, it can successfully serve the patient for the rest of his life.