The headlines suggest tooth regrow will be available in a few years. And it might, if you're an infant who's missing a tooth under specific circumstances. Also, in this case the scientist is hinting at more than he can deliver right now (based on the research), and he conveniently has co-founded a company to develop this drug. Let's just say I hope to be proven wrong, I could use three new teeth since I lost the previous ones 35 years ago.