Great for cats, too!
I've used this on my cats for a couple years and it works great. They both love the flavor, and it does a great job on their teeth and gums. They always get good reports from the vet. I've read elsewhere that for use on cats, it's recommended that this be used every other day - I think because some cats might be sensitive to the Tea Tree Oil. I've used it on my cats every day with no problem, so you'll just have to observe how your own cats handle it.