since your root canal
has started two days back i can understand that it is quite painful till the time your tooth is under anesthetic
effect it does not pain that much ,but once the effect of local anesthesia
wears off you start feeling pain which gradually increases. for that, you can request your dentist
to give you pain killer,eg ( combiflam
, just before the effect of anesthesia wears off, i e once your dental seating gets over immediately take the pain killer. and you can continue this for every six hourly for another two to three days till your canal preparation is completed after that i am sure you will not have any pain in that particular tooth and the adjacent teeth.
a single nerve supplies to most of the tooth in lower jaw so you are feeling this pain in several teeth ,but need not worry once your root canal is done you will not have this problem.
i hope your dentist would have prescribed you antibiotic and pain killer. if not, you can request your dentist for a course of antibiotic and pain killer for three days.