I'm perplexed, if given systemically, does it just regrow missing teeth or try to a grow a 3rd tooth where there's already a functioning adult tooth in place?

How can I join this testing?

Hahaha #eitm

I've read about this thing a few times over the last years. It seems all research is done in Japan, there's a lot of fuss about it, but as far as I know it has never been proven to work if the tooth to be replaced is a permanent tooth. There is a lot of hype from the scientists "wo do believe it will work" kind of stuff.