This is John. John is a boxer. John needs a powerful mouth guard that can best protect his brain from knocking against his skull, causing a concussion, traumatic brain injury, or worse (we're talking d-e-a-t-h). Have you seen the research on what concussion, especially the multiple concussions sustained by a boxer or football player for example, can do to a person. Over time? It's disturbing, isn't it? If you don't know what we're talking about, google it. Anything with :edu (i.e. "concussion:edu") is going to heed you credible intel because you should never take someone selling something's word for it and the "edu" means education so it has to be legit. Right?