Q. Hello. Three days ago I had a root canal on a back tooth.The dentist did not crown it but said I may need a crown at a later date.Today it has stareted slightly hurting again which I find strange as I thought the root had been removed.It did not hurt at all when I had the temporary filling in for a week whilst waiting for the second part of the root canal. It also seems sensitive when I bite down. As it is the weekend I cannot get to the dentist and it is not an agonising pain. Do you have any advise. Thank you