I'm not against anyone using pet tooth paste, by all means.
I even asked my pet store if it was okay if there was a difference between cat tooth paste and dog tooth paste.
To put this into perspective, when I brush Thor's teeth with diluted Listerine, I use one measuring cup of water that is 10% Listerine. Then I use <5% of that solution with brushing his teeth. So there is a tiny, tiny amount actually going into his mouth.
Thor actually likes the minty flavor just as much as the toothpaste (and hates getting his teeth brushed with both). As for the benefits, as I said, it's much easier for me to determine when I've actually done some good. With chicken toothpaste, I can't really tell if I've made any difference or not because Thor's mouth smells just as bad before and after. I could forget to brush one side of his mouth and I wouldn't know about it. With Listerine, there is a very distinct difference. And FYI, Listerine does address tartar, it's not like a breath mint.
Anyway, I certainly wouldn't discourage anyone from using dog-formulated toothpaste. At the same time, I think there's some value in differentiating between things that would be very dangerous for your dog, say, eating a bunch of baking chocolate, and something that stands a very small chance of being harmful. I have actually read books that said you should only give your dog bottled water. Most of us would think that's excessive, despite the flouride, correct?
So, anyway. I think that's all I have to say on the subject.