Review on 6DS Sports and Fitness Mouth Piece by New Age Performance - Boost Weight Lifting and Non-Contact Sports Performance, Black - Jaw Stabilizer and Performance Enhancer by Francisco Holmes

I was really hoping it would work but after following the installation video and putting the mouthpiece in hot water for 50 seconds it did Mouthpiece too soft and twisted turned into a ball of gum I tried to reheat and redo it but too late it became unusable I'm not sure if I did something wrong or it's just too difficult to fit .The website says you can return if you are not satisfied after 30 days so hopefully they will keep their word and accept my return.I would appreciate some advice on getting the right size as I use this device would like.