Before the invention of the Mouthguard, the mouthpiece was primarily used to protect athletes from cracking or chipping teeth, biting the tongue, and concussions. Now, with Mouthguard technology, dentists are providing customized mouthguards for athletes that provide many bonuses when training and competing. Some dentists considering a mouthguard as a game-changing piece of equipment might seem farfetched. But, if you think about it, the mouth is one of two airways that feed oxygen to the body's muscles and expels carbon-dioxide.