Why cant you have a clear mouthguard in lacrosse?

Answer 1

It is very hard to tell if someone is wearing a mouthguard if it is clear, especially in men's Lacrosse where the helmet further obstructs the view. Wearing a mouthguard in a sport like lacrosse is essential not only for protecting the teeth, but also in preventing concussions. If a player is wearing a clear mouthguard the referee is unable to tell if he or she is actually wearing it. Some refs will let you color in the front part of it with a black permanent marker, to more clearly indicate that the player is wearing the required safety equipment.