I just had this done today, and to be honest, it was a non-event. It went like this from what I remember:
- Numbing Gel on gums
- Computerised local anaesthetic thingy put into gum which I didn't feel at all
- Some prodding by dentist
- More local anaesthetic
- Rubber Dam put around tooth (felt a bit uncomfortable on the opposite side of the gum at first but nothing bad)
- Drilling taking out temporary filling
- Drilling down into the molar
- Filing out of the root canals (4 of them!) and removal of nerve, along with anti bacterial rinsing
- Another temporary filling put in ready for crowning at next appt.
Basically, I didn't feel a thing, and now the local anaesthetic has worn off, all I feel is a bit of discomfort where the needle went into the gum. That's about it really. They even put a camera in and showed me what the canals looked like
I would definitely recommend the BUPA Wellness dental clinic in Cornhill - they do a great job and make sure you feel absolutely no pain whatsoever (even the hygeinists will use numbing gel and give you LA if you really want it).
I thought I'd post for the benefit of those who are terrified and might have this coming up
For the record - I still had live roots/nerve and tooth.