I recently bought the book death and dentistry. It was written in 1940. In the last section of the book, its stuffed full of case studies of people who were cured of all kinds of chronic diseases, skin infections, heart disease, just general fatigue and sickness by having teeth removed. In some cases they got better by having vital (living) but diseased teeth removed. They also did a lot of cavitation surgery on patients, opening up old extraction sites and debriding the bone. They were also well aware cavitations can exist even though the x-ray shows basically nothing.