Ozone is now injected into the cavitations, and the bone regrows. Apical ozone injections [root tip] can get rid of the infection and 'save' the root canal tooth. I've got 3 of them, one was infected and saved. Intravenous [IV] ozone injections have been shown to eliminate viruses, bacteria, spirochetes, cysts, and any anti-biotic resistant pathogen.
Please ask if your biological dentist uses ozone. If not, find one here: http://www.aaot.us/
and here:http://www.iaohd.org/
Email them and ask for a referral if none shows up on the search. Best of health.