Hey, I usually never use a mouthpiece, cus all I have ever done is backyard box for the past 2 years. BUT there is a gym opening up around me, and I called the guy and he invited me over for sparring come Tuesday. I'm very excited, its gonna be tight. Anyway I have an Everlast double mouthpiece, but have never used it, I'm going to open it finally and use it for this occasion though. Should I use it or go buy a single one?