Why do Animals have a white teeth

I am curious because animals do not do tooth brush? I mean they eat grass but not for their teeth but to vomit.

I didn't do tooth brush for 2 Weeks and look at my teeth now!? Ahahaha! YELLOW!
So what causes them to maintain white teeth?

I would think that most animals don't eat high-sugar foods aside from some species which eat fruits, and so healthier diets may prevent plaque buildup. Also, since we're the only animals whose diets include refined foods (breads and any processed foods) typically lower in fiber, our teeth tend to see more food buildup. Although I'm sure plaque and tooth decay do occur among other animal species.

Cause your adopted

because animals lick they dont kiss........kissing make your teeth yellow..........you ask why well you know..........................aliens

face it, we eat some pretty bad things. :(