My teeth are bad, I hate em, a lot of em are gone and I hate wearing dentures. I've always knew that someday they will find a way to replace teeth with live ones even when the patient has stopped growing new teeth. I read an article on the November 2009 issue of JADA where some smart guys were able to demonstrate the feasibility of using bioengineered tooth germs to regenerate lost teeth on mouse models. The teeth had characteristics of naturally forming teeth such as histologic appearance and hardness of dentin. This is a step forward for my dream, I'd love to see the day when this becomes common place, given that a lot of people lose their teeth and it's a pretty useful thing to have :P