University of Portsmouth Sep 3 2025 A new study led by the University of Portsmouth suggests our saliva is stronger than we thought.  The research, published in PLOS One, is the first to examine how drinking apple juice affects saliva's lubricating properties using advanced scientific techniques.  Saliva plays an important role in preventing friction and bacteria in our mouths by creating a slippery film on teeth. It also helps repair early damage to tooth enamel. We know this protective layer