Researchers at the University of Washington have developed a lozenge that can rebuild tooth enamel, which is set to undergo clinical trials. The lozenge contains a genetically engineered peptide, phosphorus, and calcium ions, and can deposit new enamel on teeth. This innovation has the potential to provide a safer and more effective alternative to traditional tooth whitening treatments. The researchers aim to demonstrate the efficacy and safety of the lozenge and explore its potential applications, including over-the-counter use and dental office treatments.