Why do teeth don't regenerate?

Seems pretty dumb in our biological design to not be able to regenerate such a functional (and also easily breakable) part of our body.

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There are no stupid questions. But there are grammatically flawed questions.
- I tried to rephrase his question in my head, and I ended up with “Why do not teeth degenerate.”
  
  I need sleep.
- English dos do be done daft. https://inv.us.projectsegfau.lt/watch?v=6lhxxiqqlQY&t=293

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