In an animal without lips to moisturize the teeth, what would be the best structure for the teeth to be made out of?

Our teeth are prone to fractures when dry due to their crystalline internal structure. Because of this, a majority of terrestrial animals with a similar tooth makeup have lips to keep the teeth moist.

What composites for a tooth could be made to circumvent this issue? Ideally, this structure wouldn't be too metabolically expensive, and horns, claws and potentially fur could be made with some of the materials.

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In an animal without lips to moisturize the teeth, what would be the best structure for the teeth to be made out of?

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