When I was a pre-teen, my dentist opted to pull out my 2nd molars so that I would not have to get my wisdom teeth pulled. I'm 22 now and my top two wisdom teeth came through in the last 6-8 months and my lower left one is beginning to. The upper teeth are only half the depth of my 2nd molars. Four days ago, I began feeling pain in the upper corner of my mouth along the very top of my gum line. I excused it as being a canker sore but the pain has continued and worsened. I have a lot of pain in my last three teeth, though none of them had any significant decay when I last went to the dentist three months ago. I also have pretty severe pain in my lower jaw below where my wisdom tooth should be growing in, and it continues backward (perhaps toward my lymph nodes). There's a bump on the inside of my cheek along the top against my teeth. The gum swelling is red and pretty painful. The whole thing is giving me a headache, mostly from constant pain. I can't tell what is radiating pain and what's actually affected. I brush my teeth regularly and floss; I had a clean bill of teeth health the last time I went to the dentist. What could be wrong?