I went for my regular dental appt. I was told I had a huge decay in my r. upper rearmost molar. My dentist drilled out all the decay. She said she could see the nerve but did not hit it. She had to do a build up on the tooth and put all medicated layers along with a temporary crown. My tooth hurt pretty bad for about 3 days and then from time to time was a little sore, nothing bad. 2 1/2 weeks after temporary crown put on I am having severe pain. The pain radiates up to my temple. Throbbing pain worse after eating or drinking hot or cold. Would it be wise to just have the tooth extracted since it is the rearmost tooth? Do I have an infection? Why after 2 1/2 weeks did the severe pain start?