One thing is using rapamycin for bone and soft tissue regrowth. The FDA recently approved a human study after previous research showed success in mice.
It's laboratory antibody serum from a specific human-sourced monoclonal cell line.
Seems to work on all mammals (notably both nice and ferrets; I'm told their teeth system is widely different evolutionary and that humans are kinda in the middle).
A human study should be ongoing on some children in Japan that for genetic reasons are missing a few adult teeth (never grew).
https://dental.washington.edu/uw-periodontal-study-receives-...