hi I had a root canal done about 18 months ago and about 3 month ago started having pain come and go especially with hot drinks,or if I tapped on the tooth well it got bad so I went to my dentist who did an X-ray and couldn't find anything so she's sent me to an endodontist next week this was a few weeks ago as I couldn't get in,well the last few weeks the pains totally gone So now I'm unsure whether still to still get it checked out?also wandering what they'll do?ive never been to an endodontist and if my dentist couldn't find anything how will they? Thanks so much for any replys!!