I've not seen this doc, but as a dental assistant, I've seen some pretty horrific things happen to root canals. Abcess, cyst, pus, all attached to these "successful" root canalled teeth as we extracted them. If it was your hand and it was gangranous, they wouldn't hollow out your fingers so you could keep it, it would be cut off. No root canals in my house thanks, implants are a far smarter option.
Melanie CDA