What is EAER and why do dentists want to put it in your mouth?

Developed at King’s College London, Electrically Accelerated and Enhanced Remineralisation (EAER), accelerates the natural movement of calcium and phosphate minerals in a damaged tooth, according to the Guardian. The pain-free technique would be used as a replacement treatment for cavities, used instead of drilling and injections. Some predict the technology could be available in three years.