There is no research to support your claim. There is no such thing as cavitations. The American Association of Endodontics has discredited cavitations, NICO, whatever you want to call it. Yes immune systems become compromised at some point but this is not due to a root canal. What about the rampant periodontal disease that 70% of the population has. Why don't you advocate the removal of all teeth. That is the only way to be sure that periodontal disease doesn't cause cardiovascular problems.