Comment by paulpauper

yup here is one from 2007

https://www.technologyreview.com/2007/02/22/272845/regrowing...

As it turns out, this is really hard to do. There are a lot required of teeth: they have to be extremely durable to resist repeated strain of chewing ,stay in the gums, not be rejected by body, etc. It's little surprise progress has been so slow.