I was against root canals no matter what, but was surprised to discover that a biologic dentist here (possibly best in the country) seems to be taking them onboard. He would never do them once becuase of the toxicity and is trained in every aspect of biologic dentistry, travelled extensively and is in touch with like-minded dentists all across the world. He has also been on the internet involved in debating with other dentists (who still use mercury).

So there must be a way of doing them now that obviously appeals to him. He wouldn't go near it otherwise, he's ultra fussy. Here is what is said about the root canals on his website.
http://www.integrativedentalmedicine.com/ocalexic.html

a dentist in Australia that has studied in oral toxicology etc, does them also. He talks about it on his website. You maybe interested in checking this out.
http://www.shdc.com.au/?s=services&p=root-canal-treatment

So perhaps they have found a way of doing them now that far surpasses how they have been done in the past (or are still being done by some other dentists who may not be aware of the toxicity issue with them).