Fillings that can actually REPAIR tooth decay?

This would be amazing!

The first data on dental fillings that can actively repair tooth decay has been presented by a researcher. This data, indicating smart repair of tooth decay, prolonging the life of composite fillings and reducing the need for mercury based amalgams indicates a significant step forward in tooth restorative materials. Read more:

https://www.sciencedaily.com/releases/2016/09/160926100014.htm