In endodontics, one focuses on the treatment of blood through the tissue in the interior of the tooth. This being the dental pulp or nerve.
Because of tooth decay, large restorations, cracks or accidents, the tooth nerve can become inflamed, or become exposed in the event of a trauma.
If this happens then the dentist is forced to perform a nerve canal procedure. With special files and solutions they will be trying to make the channels clean and sterile.
If the channels are clean and sterile they will be filled with special filler that is called gutta-percha. A nerve canal treatment is a very precise and long-term treatment. It is possible that your tooth after this treatment must be fitted with a crown.