Firstly, unlike most reviewers, I paid full price for it. They cannot be formed exactly. I've made at least a dozen thermos and molds with no problems, but with these they're very flexible, even at room temperature. When heated in 200 degree water, they shrink and deform, but still don't follow the shape of your teeth. I'm going to try the Shock Doctor mouthguard and see if I can get better results with it and the whitening solution.
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