Facts

So if I have a baby my ankle I twisted 3 years ago will heal?

Your body might not consider it an issue anymore, so most likely not. However, if you twist it again, it’ll probably send the stem cells

So my plan should be-- get pregnant, deliberately twist ankle, bask in stem cells

In all seriousness, when I was assaulted years ago, I seriously damage my hip, basically it dislocated but was never treated so it went back in, but slightly wrong, didn't heal right, kept dislocated or shifting so it was laying on a nerve. Anyway, fast forward to when I was pregnant, my hip finally stopped hurting, and since hasn't given me nearly as much trouble in the last 6 years.

Teeth are bones. Bones don't grow all that much, especially when out of the body

No, they are not bones.
https://www.livescience.com/33130-why-are-teeth-not-considered-bones.html