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Various_Succotash_79 t1_j2fi1o7 wrote

IME, you have to be careful because there can be hard things in them that scratch.

Calcium? Shells? Idk what it is but it hurts.

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weirdgroovynerd t1_j2fr158 wrote

Teeth maybe?

I've seen plenty of those SpongeBob documentaries, so I know that natural sponges have prominent incisors.

5