I don't believe it is as good as a good brushing, nothing could replace that. But for difficult pets, like mine, it si better than nothing.
She tolerates it okay. It is supposed to be tastless, and I keep it in the refrig, so I don't think she is happy about that, but seh only fights me mildly, not enough from keeping me from just sqirting it in once a day. I sqirt it in the side of her mouth as the Vet instructed.
I will have to ask the Vet at some point in the future how her teeth look. If they look crappy, then the stuff didn't work.....
That is all I know.