Not a dentist, but I've lost a couple of teeth to bruxism - they were cracked all the way down to the roots. The endodontist told me there was nothing that could be done to fix them. Got one of them replaced with an implant. I wear a mouth guard now when I sleep so that things don't get worse. Since I suspect there are maybe a couple other teeth that could be have the same problem I'd very much like it if there were some way to regrow teeth.

If you can afford it check out botox as a treatment/cure for bruxism. Treatment is approximately $500 and you will have temporary relief for 4-6 months. Some say that after 3 treatments you can be cured.

Is it that rare or do you just live somewhere where it's rare? I see people with missing teeth all the time, and I'm sure I see a lot more with suboptimal replacements that look like teeth but really aren't.

There's "need" and there's what we might want to do. I have lots of crowns and if my dentists could have cleaned out damage and made the tooth regrow instead that'd have been preferable to having to do more and more invasive repairs.

Modern dentistry has come very far, but it's not perfect.

That 'so long as you are able to' is doing an awful lot of work there.