London ON.'s Byronwood Dental Office's Dr. Jeff may recommend a root canal for a number of reasons. It may be because the tooth is abscessed, is dying, or is needed to help retain a crown. Root canal therapy has come a long way in recent years and the procedure is usually no more uncomfortable that having a filling done. It just takes longer. Dr. Jeff will provide medication and post-operative instructions that will help you stay comfortable after the procedure.