Seeing an endodontist for retreatment or periapical surgery is advised.
Have you read the book Root Canal Cover-up by George E. Meinig D.D.S., F.A.C.D.? It's available from Amazon and also from the publisher Bion Publishing directly by mail. It tells how teeth that have had root canals usually remain infected and leak. The chronic infection in these root canal teeth cause a wide variety of chronic degenerative illnesses in many other parts of the body. If the tooth is still infected, you would want it removed - broken drill bit or not. But, the tooth must be removed using the correct protocol to avoid further trouble - see the book. Get the book and read it. But, of course, please consult with wholistic dentists and/or oral surgeons before proceeding.