My mother and brothers knocked me around and bashed out my teeth twice while growing up. I didn't get dental work until I could afford it myself when I was 18 and since then it was a downward spiral with dozens of mercury fillings, root canals, you name it.
Until I can afford $20,000 of biological dentistry I have to keep multiple infection sites under control. I've learned to gargle with Colloidal Silver /oregano oil etc consistently. That can do alot but you have to be consistent and don't let up just because the symptoms subside.
The best thing I've found is bubbling low flow (1/32lpm) medical ozone into the mouth regularly being careful not to breathe it. Gargling with ozonated water is also great. Oil pulling with ozonated oils is magical. All of these will over time fight down deep infections even into the jaw and cavitations and under crowns.