Mouthguards are required in only four school-based sports: football, ice hockey, lacrosse, and field hockey. Yet basketball and baseball are associated with the largest number of dental injuries. Other sports for which the American Dental Association (ADA) recommends wearing a mouthguard include bicycling, soccer, skateboarding, wrestling and volleyball. Do mouthguards work? The ADA estimates that athletes who don't wear mouthguards are 60 times more likely to suffer dental injury than those who do.