There is a documentary called Root Cause (2019).  It used to be on Netflix.  This documentary was about how Root Canals can cause disease and pain in other parts of the body (e.g., breast cancer, rheumatoid arthritis in joints, back pain, etc).  The American Dental Association (ADA), the American Association of Endodontists (AAE), and the American Association of Dental Research (AADR) sent a letter to Netflix asking them to take the documentary down for allegedly "spreading misinformation." 

Netflix capitulated and removed the documentary.  But it is still available to watch on YouTube, https://www.youtube.com/watch?v=vGusDIvEHAo and on Rumble, https://rumble.com/v6tiu4f-root-cause-documentary-redpill-drifter.html, and on Vimeo, https://vimeo.com/ondemand/rootcause/258735517. 

In the Root Cause (2019) documentary, at timestamp 10 minutes, they interview a doctor named Dr. David Minkoff, who tells the story of a patient he had (a young woman) who had back pain and had to use a cane, he injected Procaine into her tooth, and suddenly her back pain disappeared.

*IMPORTANT: This website is NOT saying that Root Canals cause Cancer, or that removing Root Canals will cure Cancer