A possible evolutionary reason: In the days before modern dentistry, it was still possible to have a tooth violently removed, and that might be necessary when it’s the only way to deal with abscesses, etc. It takes a *lot* of pain to motivate someone to have their tooth removed in those circumstances, so your nerves are just trying to give you the motivation you need.
Other forms of pain are often just telling you something like, “stay in bed and rest”, and it doesn’t take constant agonising pain to do that.
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