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.
Keep in mind this hasn’t been shown to actually help teeth in someone’s mouth.
Just from that, it seems like its a patch job, not capable of regrowing from zero.
i wouldn’t expect that from a gel