I just got this new mouthpiece and I think its the best one I've used so far, I would recommend it for everyone. I ordered it out of the ringside magazine, I think its called the golden gloves mouth piece or something. No boilling, you mix the liquid and powder together and after mixing you pour it into the mouthguard shell, after it dries a little bit you can put it in your mouth to mold it, then take it out and let it finish drying. You can breath out your mouth with you jaws tight and its a really good fit. I can't even spit mine out, I have to pull it out