I wear one, its one of them custom ones from the ortho, shit works great, i can talk, and it just stays in and i dont even notice it half the time. I started wearing one after a massive concusssion i got last season, dr said hed let me get back to it sooner if i promised to wear that and a POC helmet (hes a rep), I hated the helmet but the mouthgaurd is a great idea seriously