About a year and a half ago I had an infected tooth. Upper right side, the one right behind the canine. I had a root canal on this tooth about 12 years previously, then because of problems, a second one on the same tooth about two years previously.
The infection was really bad. Puss oozing from holes in my gums. A course of anti-biotics failed to clear it up. I went back to Dentist, who sent me back to the place that had done my second root canal, and they sent me to the Endodontist.
Cut on either side of the tooth, peel back the gums. Found an infected cyst at the root and drilled it out. That was pretty nasty. My face swelled up for several days and I had some minor facial bruising, when I almost never bruise. Missed two days of work, came back on the third day because I’d need a note otherwise. They took one look at me and sent me home for another two days.
Second, Third, Fourth courses of increasingly strong anti-biotics, finishing with stuff that knocked me on my ass. Each time, the puss would clear up for a few days, then come roaring back.
So I went to the Dentist, who sent me downstairs to the oral surgeon, and had the damned tooth removed. Still have a hole in me head, haven’t had anything else done with it. Fifth course of antibiotics.