Hello Doctor, I had been having pain in my left molar... last one... for almost 2 years. One fine day my whole left side started paining and I visited the dentist. The dentist diagnosed cavity and a root canaling procedure was done. Presumably the cap which was put in was not correct, since I experienced a lot of pain. After about 2-3 months, the cap came out during a regular tooth-brushing procedure. However, there was no pain hence and so I could not visit the doctor. Now after about 8 months, I visited the doctor again as the pain increased. The doctor redid the cap and this time the cap was fixed properly as I experienced no pain post the procedure. However, she noticed that there was a swelling on the left side and gave an antibiotic dose for 5 days. The swelling subsided shortly. Now 2 months later I am experiencing pain again. Behind the cap, I can see a small swelling emerging from the gums and I can feel pain in the left side of the face. In the bottom of the left side, on frontal neck part I can feel a small swelling. In addition to this I experience difficulty in opening the mouth completely. Please advise