About 3 months ago I woke up with a terrible stomach pain which seemed to be some kind of food poisoning, 3 days later, about when the stomach pain was almost gone, I woke up with excruciating tooth pain on my molar (tooth 19) , which had a crown and a root canal previously.
Just to be safe, I went to two dentists to see what the issue was, after x rays, they both concluded I had a tooth infection on that molar, tooth 19. They recommended I get a root canal cleaning by an endodontist.
I went to one as soon as possible, she cleaned everything up, and after the surgery she said there's about a 50% chance this will recover, the problem being that my tooth might be cracked, and the infection might start up again.
I went back to the endodontist 3 months after the root canal cleaning, and she concluded that I still had an infection and the only option is that I get the tooth extracted, she also said the earlier I do it, the better.
So I went to my dentist, who would get the extraction done, thinking this issue would be finally over, the local anesthesia didn't work. My mouth felt "numb" but, it felt numb as if I was at the dentist 3 hours ago. I could still feel pain, touch, and talk fine. He injected the anesthesia a couple more times to no avail.
He said the infection is causing the anesthesia not to work. And he prescribed me with stronger anti-biotics ( I have been on amoxicillin for the past 2 weeks, 3 times a day).
As much as I respect his professional opinion, I am wondering why the anesthesia is not working, considering it worked just fine when I had a root canal cleaning 3 months ago. (And the pain felt much worse then.)
What are the odds that this is due to poor practice on his part?
PS: I was a little stressed out before he injected it, just because I never had a tooth extraction before.