A performance enhancing and force absorbing mouthguard adapted to fit the upper teeth of the mouth of an athlete wherein the mouthguard is quadruple or quintuple composite material of distinct materials. The first internal layer is a non-softenable flexible framework which will permit the mouthguard...http://www.google.es/patents/US6505627?utm_source=gb-gplus-sharePatente US6505627 - Composite mouthguard with palate arch and anterior palate opening
Composite mouthguard with palate arch and anterior palate opening
