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.
Oh, man, that reminds me of one time when I cracked a tooth and couldn’t get in to see the dentist for a while. Cleaning the whatever out of the inside was so gross in smell, taste, and feeeeel, and so incredibly painful.