Field in dentistry dealing with root canal treatment. Such treatment should be prepared by making a dental or pantomographic photograph, and sometimes also a 3D image on a dental tomograph. It is worth mentioning that the electronic device called the Endometer plays a pivotal role in this treatment, thanks to which we can make a precise measurement of the length of the canals. Root canal treatment involves thorough cleaning of the canals and their sterilization using specialized tools and rinses, and then sealing them tightly. Thanks to this treatment, a dead tooth (this is what we call a tooth after root canal treatment) can function in the mouth for many years to come.