Tropiclean came up with Clean Teeth Gel for Cats because they know cats are independent creatures who generally don't take kindly to things like brushing. It's brush-free.  The gel circulates throughout the mouth with your cat's saliva.

To apply, wait till a relaxed moment, and use the applicator to pop a couple of drops into each side of their mouth. It’ll get to work immediately, softening plaque and tartar from teeth and killing the germs that cause bad breath. There’s no taste or smell, so your cat won’t have a clue what’s going on – but you’ll notice the results within weeks.