Do you use them? We do - but for years we've used the Everlast double guard (I find it easier to breathe through the center hole than when I wear a single guard), and I had trouble getting the last one to soften properly and thus fit right, so I'm going to get a new one. I've heard good things about the Shock Doctor mouthguards - I was wondering if anyone knew anything about them, or other mouthguards - which one you use, why you like it, and where you get it.