Apicoectomy Family Dentistry & Orthodontics In Sterling, VA An apicoectomy is a minor treatment that involves removing the infected tip of a tooth root, then sealing the interior of the tooth to prevent further infection. In most cases, when pulp in the root of a tooth becomes infected, root canal therapy is performed. This removes the infection and prevents it from spreading further. In traditional root canal therapy, the full pulp is removed from the tooth, along with any infected tissue. When this is not possible or previous root canal therapy has failed, an apicoectomy is recommended.