This gorgeous beast here, the late great King of Cats, Rocket J. Squirrel, used to like having his teeth brushed. Didn't do a lot of good, since he still had problems with tooth decay (the vet said it was genetic with him, he had softer than usual cat teeth.)
When we lived in Boston, we had a nightly ritual. He'd go sit on the toilet tank, I'd load up a cat tooth brush with beef flavored toothpaste and he'd allow me to brush his teeth. I kid you folks not. This cat was special that way.