What is this close-up picture? (WotsThat: Shark tooth texture (macro))

Question

What object is shown in this zoomed-in close-up photo?

LazuliteQ · Accepted Answer

Shark tooth texture (macro). Sharks continuously lose and regrow teeth throughout their lives, and a single shark can go through tens of thousands of teeth over its lifetime, which is why fossilised shark teeth are so commonly found on beaches.

Answer: Shark tooth texture (macro)

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