Snaggle-toothed hockey players and sugar lovers may soon rejoice as Canadian scientists said they have created the first device able to re-grow teeth and bones.
The above is a direct quote from the article being discussed, which is what I was responding to. You may want to RTFA more closely yourself... do you really think all this discussion and excitement would have been generated solely from an engineer making a gadget small enough to fit in someone's mouth? I think you missed the point of the article. Also, the gadget was scaled down to fit inside a person's MOUTH, not inside a tooth. RTFA.
The only dentist mentioned, Dr. El-Bialy, did not "invent" the concept of using ultra-sonic technology in dentistry; it's been used for many more years than since the '90's. He does appear to have used it in a different way and to treat a different problem than before, which is highly commendable (search for his abstract on PubMed). BUT he used it in the 1990's to treat root resorption that occurred after orthodontic treatment, NOT to completely regrow a brand new tooth. My point was that Chen, who is an engineer, is the one saying that this technology can be used to regrow a whole tooth. That hasn't been shown yet. The article does not say that the dentist backs up that statement. In my OPINION, Chen is getting a little too excited about ultrasonic technology and his scaled-down gadget. My guess is that he doesn't know a whole lot about dentistry and what is needed in order for teeth to grow. As I said before.