http://www.nytimes.com/interactive/2007/10/26/sports/football/20071026_XENITH_GRAPHIC.html#step1
FWIW, I got into a conversation last night about mouthpieces. Most think they are to protect the teeth but they are designed to prevent concussions.
FWIW, I got into a conversation last night about mouthpieces. Most think they are to protect the teeth but they are designed to prevent concussions.