Root canal therapy is a procedure used to save a tooth that is severely infected or damaged. When the pulp (the soft tissue inside the tooth) becomes infected, it can cause intense pain and lead to abscesses or tooth loss if left untreated. A root canal removes the infected pulp, cleans and disinfects the inside of the tooth, and seals it to prevent future infection.
Despite its reputation, modern root canal therapy is typically no more uncomfortable than a routine filling, and it can relieve the pain caused by infection almost immediately. After the procedure, the tooth is often restored with a crown to protect it and restore its function.