Man, I don't know about this shit. You ever watched the Spider-Man cartoon, and the scientist guy uses lizard DNA to regrow his severed arm, except it actually turns him INTO an alligator? This tooth medicine could make you all teeth. You'd look like Pac-Man, or Sheryl Underwood.
The team believes that in the future it may be possible to grow teeth not only in people with congenital conditions, but also in those who have lost teeth due to cavities or injuries.
Quote from the article. This medicine doesn't actually regrow teeth, it deactivates a protein that prevents existing tooth buds from developing into teeth due to some congenital conditions. If you have lost a tooth that had already developed then the tooth bud is gone and this treatment isn't expected to restore a missing tooth bud. This is a step toward regrowing lost teeth but without a way to generate a new tooth bud this isn't going to get us there.
Drug prices are complicated (kind of... But not really) . There is an exorbitant amount of R&D required to get something from hypothesis to the market.
BUT, in the US at least some of that burden is borne by the taxpayers.
Now the actual cost of making a drug once it is invented and gone through trials doesn't seem to make much of an impact on the final cost. Drug companies seem to want to charge as much as humanly possible.
Until the US has some sort of a policy change where they can influence final cost of they give tax payer dollars, then prices are going be high and get higher based on nothing but greed.