It's a 50/50 product, but when it works, it's amazing.
I purchased the 3-packer with all the different levels of Jawliner 3.0, but all of them got destroyed, and its not me doing it wrong, but as customer service said, some people just have shaper teeth than other, and then it won't hold up. But they kindly send me a pack of chewing gum instead to see if that would make a different experience. Looking forward to try that.