In the report the vet gave us last week after Ruby's dental cleaning and tooth removal, they advised that we brush her teeth as regularly as possible and that we use Oravet to prevent plaque build-up (they applied some during her procedure).
We've tried brushing her teeth -- an impossible task because she is the wiggliest, most uncooperative "patient." I'm going to try it again and stick with it longer to see if she'll do more than just bite the heck out of the toothbrush. 
Of course, the vet can sell us the Oravet. I'm guessing I can find it on Amazon or maybe even a pet store for less money. But I'm not even sure it's worth using. Again, with a wiggly patient, how much am I going to successfully get on her teeth? And is it really effective anyway?
Thought I'd ask if anyone has used it, what your thoughts are, and/or if you've got other suggestions for preventative dental care. Thanks for any input!