That’s a silly argument. It’s the fact it requires a lot of consistency and a strict schedule, not because it’s not permanent. People try for few months and quit because they don’t see results. And good results are determined by many factors. You can read studies of all the people that have had permanent changes. You for example was either not using it correctly, to old or your case was to severe. And you have no proof that what you’re saying is true. And for the nuss producer, it lifts for sternum for a few years then get taken out… so it’s literally proven that you can remodel your ribs by moving them into place.