Your wisdom teeth are impacted. That's how mine were. I started to notice their arrival when I was about 18. Every few months to a year, they would act up...as if they were trying to emerge through the gums. Finally, when I was 24, they became extremely painful and were determined to come through. I had 5 for some unknown reason (one was growing in on top of another), all impacted. I went to an Oral Surgeon and as others have pointed out, this is a MUST! They knocked me out with twilight (three types of anesthesia) and cut them all out. It hurt, I'm not going to lie to you, but I was so glad to be done once and for all. I was on Darvocet and antibiotics for a week.