After noticing that many children in Bangalore, India wouldn’t smile because of their dental problems, Morgan Snyder, and a few fellow students from the University of Pennsylvania developed Sweet Bites, a low-cost, xylitol-based chewing gum and brought it to Bangalore to help fight tooth decay in children there. Chewing sugarless gum has long been thought to help decrease the incidence of tooth decay, probably because it stimulates salivary flow. You can read about this initiative here.