51
Breakthrough gel can regenerate tooth enamel within weeks
(newatlas.com)
This is a most excellent place for technology news and articles.
No offense, but unless you have some sort of condition like not growing enamel, what have you been doing for your teeth to be that bad at not even 50? Chewing on anvils and flossing with barbed wire?
Bruxism. Why, what's wrong with you? Sheesh.