It is a treatment method applied in cases where the nerve (pulp) in the inner part of the tooth is damaged or dies due to caries or trauma. It is the process of removing the nerves inside the tooth, shaping the canals in the tooth roots and purifying them from microorganisms, and then filling the enlarged canals. Then, restorations such as fillings, porcelain, crowns, inlays, which are deemed appropriate by the physician, are made according to the loss of substance on the upper part of the tooth and function continuity is ensured. Otherwise, the tooth may need to be extracted.