I have, sadly, fillings and a couple of crowns. I have not noticed any loosening of any dental work or any adverse reactions from the pulling, and I have been pulling for over two months. I am sure, though, if there is an infection or something going on in the mouth the pulling could indeed 'root' out the problem. My thinking is, if my body does the work to get rid of it then maybe I will just have to agree with it and find a way to deal with it $$-wise.
Till then, I swish *and pray*...!
The benefits far outweigh the risks, in my opinion...