Endodontic treatment, commonly known as a root canal, is a dental work which takes place in order to save a tooth with damaged or dead pulp, from the penetration of the caries and the microbes that accompany it to the inside of the tooth, namely, its nerve. It is usually accompanied by acute pain, an abscess and / or an edema (swelling). During the endodontic treatment, the nerve is removed, the root canals are cleaned and obstructed with special pastes. After the procedure has ended in the denervated tooth, in the majority of cases, because it is vulnerable, a cap or resin onlay should be placed, for greater protection.