From the end of the article: "That said, regenerating a tooth from within would only be useful in a relatively small number of cases. Most cavities would still need to be drilled and filled."
I'm assuming from that sentence that the treatment will be costly. Though, honestly, for a tooth regeneration treatment you'd not need high margins for profitability.
What with the number of people that get cavities, I'd hope it wouldn't be hard to make profitable.
I'd also hope it'll be cheap. Getting a tooth drilled requires all sorts of infrastructure, and hours of time on the part of a trained PhD. Slapping some goop on? All you have to do is make the goop cheaper, and costs plummet.
I'm assuming that treatment is slow. So a big cavity can maybe take too long to regenerate (a year?) which means that many won't be willing to live with the pain while the tooth heals vs waiting it out and having a brand spankin' new tooth.
Still cool, I guess.