A newly developed dental gel may one day allow dentists to rebuild damaged tooth enamel, offering a completely different approach to treating tooth wear and decay. Tooth enamel is the hard outer layer that protects teeth from chewing, hot and cold foods, and acids produced by bacteria or found in drinks. Scientists at the University of Nottingham have developed a new dental gel that may help rebuild damaged enamel instead of simply slowing further damage. The gel may also help people with sensitive teeth. It may also be included in products that protect worn teeth, reduce sensitivity, or improve how well fillings and other dental restorations attach to teeth.