I was not sure how this would work, its has been a great tool for my teeth and gums. I've noticed an improvement in my teeth and gums. I just wish the replacement brushes were not so expensive. But overall a good buy.
If you have two Waterpik devices, you should know that one device can control the other. If my wife and I use our devices at the same time, when she presses the water button, my water jets start shooting out. And vice versa. Moral of the story is don't use them at the same time!