I had a root canal for the 2nd time in 4 years about 2 months ago(back bottom molar). About 6 months prior to the 2nd root canal I had been experiencing twinges and aches. I had an xray and it showed an infection. So, I went through another root canal. After my first visit I had the worst pain I have probably ever had in my life for 2-3 days. After the 2nd an final procedure (& 2 rounds of antibiotics) it began to feel better. Then 3 weeks later it began to ache again so I went back and part of the filling had fallen out. I did not have a crown put on right away because the dentist wanted me to wait a month to make sure the infection healed. So, he replaced the filling, put me on another antibiotic and sent me home. I have finished taking the medicine and my tooth still aches every once in a while. Especially when I exercise at all. I am very frustrated and feel like getting it pulled. Obviously I still have an infection. Should I try another round of antibiotics? Do I need a retreatment again? My teeth on the bottom are a little crowded to if I do get it pulled (I really don t want a bride or implant) I thought maybe they would be ok with that tooth gone? I appreciated any advice. Thank you.