A tooth that has had two root canals and still causing you pain is not a good sign. I would recommend that you schedule an appointment with a dentist soon. There is a decent chance that this tooth may need to be extracted and have a dental implant placed. Best of luck.
If you have lost a post and crown and the remaining tooth has decay it is very likely that this tooth is not restorable and should be extracted. It is always best to plan for a dental implant for the extracted tooth if possible. Ask your dentist about this option.
I am sorry that you are uncomfortable.
If the pain is there all the time, it may be from the temporary not fitting well to or inflammation in the tooth. If there was sufficient local anesthetic when preparing the tooth and it still hurt, that may also indicate inflammation in the...
