I don't have that one, but I do have a water additive....I use it sporadically at best. One of those, when I happen to think about it and actually follow through...there's usually some kind of distraction going on
And now that I have bought the water fountain, I agree that it is more than likely filtered out....but I have it, so I add it now and again anyway.
I also "brush" her teeth and count on that more than the water additive. She really likes the toothpaste so that's a pretty easy route to go and I was told....that getting the paste on the teeth was more important than the actual brushing motion, that the enzymes in the toothpaste would do the work....so that "works" for me