Inside each tooth is the nerve, also known as the pulp, which provides nutrients and feeling to the tooth. The nerve runs through the tooth like a thread. When the nerve is diseased or injured, the tissue around the nerve becomes necrotic. If the necrotic tissue is not removed, the tooth will become painful and create an abscess. In order to remove the necrotic tissue, the tooth's nerve is painlessly removed, cleaned out, and sealed off to protect it. A crown is typically recommended after a root canal to make the tooth stronger. A root canal is a simple procedure without discomfort.