Scientists 'excited' by gel to repair tooth enamel https://www.bbc.com/news/articles/cn09kwrg57do New gel allows tooth enamel to regrow https://www.n-tv.de/wissen/Neues-Gel-laesst-Zahnschmelz-nachwachsen-article26145083.html This new gel is protein-based and fluoride-free. It mimics important properties of the natural proteins that control the growth of tooth enamel