There has been a ton of research in the area of re-growing teeth from stem cells. A cursory search-engining will turn up a ton of articles, some going back decades, and many giving the impression that it's close to happening. I've been following it for awhile because I knew I'd be in the market for a new tooth eventually.

Here's an example of one from earlier this year at King's College, London: https://www.kcl.ac.uk/news/lab-grown-teeth-might-become-an-a...

There have been a lot of research around USAG-1, too [1]:

> Uterine sensitization-associated gene-1 (USAG-1) deficiency leads to enhanced bone morphogenetic protein (BMP) signaling, leading to supernumerary teeth formation.

[1] https://pubmed.ncbi.nlm.nih.gov/33579703/