I find it interesting that we are closer to regrowing teeth than hair. At least there was human clinical test for TRG-035. Is it just cause hair transplant is "good enough" stopgap solution?

I think it's more that fixing teeth is largely about replicating a specific material with one-off procedures, whereas fixing hair is all about controlling a complex never-ending process that is linked to all sorts of factors.

Also, everyone has teeth issues, whereas hair issues are mostly limited to a subsection of the population (older males, and not even all of them).

> subsection of the population (older males, and not even all of them)

Those men will pay lot of money to get back their hair though.

If I not mistaken it was Bill Gates who said more money is spent in hair regrowth research compared to vaccine to prevent diseases like malaria which kills thousand of people.