Hippos have their teeth cleaned by fish.

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Hippo's teeth
Image credit: Mehihe, CC0.

Hippos cannot brush their teeth but they can get fish to clean their teeth for them. Every once in a while, they visit a certain part of the river and open their mouths wide. The fish get food and they get their teeth clean so they can munch up more short grass, which they can eat up to 150 pounds of every night!

 

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