Q. I had a root canal done on a mandibular 2nd molar 5 days ago, was already being treated with antibiotic as a precaution. After the novacaine wore off I was in a great deal of pain. Took vicodin and antibiotic as prescribed, called the dentist the following morning. He switched my antibiotic to a stonger one and said he would see me next week. I was awake all night tat night again in pain, called his emergency number, now accompanied by swelling an an inability to eat due to pain. He returned my call suggesting that I make an appt after the wknd was over to come in to have the tooth extracted. I am 44 years old, female, in good health. This is my second root canal and experienced nothing like this with my last one. Even the exterior of my face is painful when touched. Any suggestions on what has gone wrong or what I should do?