Wdum? While the brain and rewire itself this not a cure. Not to mention a cure is universal, meaning it works in almost everyone. I know a number of stutters and I know maybe one who has, “cured” themselves. It is not common and is mostly in those whose stutter when they do this they either did not stutter much and were “cured”. Or they stuttered badly in childhood then it settled down and eventually went away. As for there being no scientific evidence I can point you to numberous studies that show it cannot be cured.