An innovative gel that forms a layer over teeth and then recruits calcium and phosphate ions from saliva to build new enamel has the potential to change dental treatment. To date, we don't have any way to regenerate the tough outer layer of enamel on our teeth as it erodes with age.
Every time you read it it’s in a mouse or a petri dish.
I wish they would put that on the headline.
According to the article, they used human teeth from cadavers
There’s a big difference between doing something in a lab and mass producing it for millions of people.