I have the mouthguard also bought new - my first mouthguard at all. I use the mouthguard in boxing. Very easy to customize. Boil water, turn off oven, take pan off the heat and place the mouthguard in's not boiling water about 25 seconds.. Then pick the best with a spoon to mouth guard out of the water, allow to cool briefly for 2-3 seconds and adjust the face mask on the upper jaw. Important - only lightly bite down, not too much otherwise you bite through the vents. As long as the mouthguard is still warm, press a finger to protect the teeth, just getting your tooth form of protection. If everything fits, take careful out there and 20 sec. set at the deep end and you're done. Therefore the mouthguard fits perfectly and completely fulfilled its purpose.
