I dont know, but Swedish artist Orup pretty much got completely rid of his stutter. [https://www.youtube.com/watch?v=DhN4TzwJ6IU&ab\_channel=Nyhetsmorgon](https://www.youtube.com/watch?v=DhN4TzwJ6IU&ab_channel=Nyhetsmorgon) https://en.wikipedia.org/wiki/Orup#cite\_note-2