I had a root canal done twenty years ago. An abscess formed above it.  Six months ago it formed a puss sack in my mouth between gum and lip. Now it has burst and I have a hole that I can see the upper side of my tooth or root through. Not having dental coverage Im in a bit of a fix. Do you know what could cause this and must it be taken care of  by a dentist? Thanks
Hi dear, As per your query you have abscess in mouth long after you had root canal. Well there can be many reasons for abscess. Sometimes infection occur again in root canal teeth because of micro leakage of through gum infection and when left untreated it creates hole also known as dental sinus. I would suggest you to consult dentist for proper examination. Doctor may order X-ray for proper evaluation. Doctor may consider root canal again or extraction of tooth depending upon the condition of the tooth. Doctor will also prescribe antibiotics (penicillin or metronidazole) at least for 10 days. Hope your concern has been resolved. Get Well Soon. Best Wishes,