I only skimmed the article but on the surface this seems to be the same Kyoto University study that was being passed around a few months ago which was explicitly not regrowing lost teeth, it’s kick-starting natural growth in people whose teeth never grew in the first place due to congenital issues. I’ll just copy+paste my last comment:

This probably isn’t going to be available to you then, though it is possible it paves the way for a tooth-replacement treatment. This article seems like bad science communication. The video, tweet, and website they link to all state that they’re researching congenital conditions, the inquiry form linked to on the website explicitly states in English they’re not considering people who lost their teeth later in life and specifically calls out articles like this one as misinformation.

We are currently receiving a large number of inquiries that differ from the purpose of this research, which is very troubling.
This research is a study of therapeutic drugs for people who are missing teeth due to congenital (from birth) diseases (diseases, etc.).
This research is not aimed at restoring teeth to people who have lost their teeth due to acquired causes, as some news and social networking sites have reported.Additionally, we are not currently recruiting candidates for　clinical trials (adult males).

That study inquiry form doesn’t exist any more (probably because it’s a bit late to join) but a similar notice is on their contact page.