What are the limitations of having an internal skeleton composed of dentin?

I'm not certain if it's possible, honestly. I know some cartilaginous fish like sharks and rays that have tooth-like structures lining their skin, called placiod scales, but I've never heard of any creature that has a skeleton comprised of dentin. This makes me question if it's even possible, and if it were; what limitations are imposed on having a dentin skeleton?

I'm not asking for a structure identical to teeth, but similar to it. The skeleton would need a supporting structure with enough segmentation to bend/curve. (a spine) Furthermore, if a flaw about dentin can be amended with an additional structure (like a protective coating or a slightly different composition), please mention it.

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What are the limitations of having an internal skeleton composed of dentin?

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