Endodontics is the branch of dentistry that is concerned with the treating the interior part of teeth. The most common procedure in Endodontics is the root canal. Inside your tooth, beneath the white enamel and a hard layer (dentin), is soft tissue called pulp. This tissue contains blood vessels, nerves and connective tissue, which help grow the root of your tooth during its development. It’s necessary to have endodontic or root canal treatment when the pulp becomes inflamed or infected. If pulp inflammation or infection is left untreated, it can cause pain or lead to an abscess or, in some instances, tooth extraction.