i had 1 few weeks ago, went to dentist she gave me anti biotics, went back 2 weeks later to get a root filling done and it hadnt cleared up, the injection didnt numb my mouth because of the infection, she then got a stronger injection and went down the side of my tooth, that absolutly killed, my eyes were watering, but numbed it in seconds, the tooth doesnt always have to come out, but dont leave it get it done soon as, 2 dog tabs wont kill it i was on 500mg anti bio for 7 days