If you train any combat sport long enough, chances are you’ll regularly get stuck in sparring. In most cases your gym won’t advise you spar (at least not with headshots) unless you have a mouthguard of some sort. In general while different products may be more or less effective, in general they all add some amount of protection to keep your teeth safe. That’s common knowledge. But what about concussions and head trauma? Does having something to bite down on make you less likely to get knocked out? Do mouthguards help prevent knockouts?