Yep, when I was getting my infected root canal extracted I told the Oral Surgeon to be careful not to let any of the bacteria/infection go down my throat. I was fearful of swallowing it. He said: "Well the bacteria has already been circulating throughout your whole system while it's been in your jaw." <-- It's no wonder why I've been ill for a couple years now. He's not a Holistic or Alternative Oral Surgeon - just a Dr. with common sense.
I would never get another root canal. That and the cavitation it left destroyed my immune system. I'm in the process of rebuilding both.