Accidents happen on the sporting field. Unfortunately facial and dental trauma is often the outcome of these incidents. Mouthguards provide protection to teeth when properly made and fitted.
Protection is better (and more cost efficient) than repairing teeth post trauma. Mouthguards also spread the force of an impact more evenly and thus lightening the force to any one particular tooth.
Mouthguards also help reduce the force of a blow to the jaws and skull.