system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do animals teeth not rot away if they can not "brush" them like humans?
gpt
They can, to an extent. But the diets that animals live on don't contain the kind of refined sugars we're used to.

If you compare the teeth of people before sugar plantations and refinery became a thing, to those after, you'll notice a huge difference.

Refined sugars are a superfood for bacteria, and that means they produce more of the plaque and other chemicals that lead to decay.