There actually are people that have made full or pretty much full recoveries with their stuttering. But I think a lot of that comes from building a positive perception about speaking, and facing speaking fears with confidence. Along with some other tings. I really recommend “Redefining Stuttering” by John Harrison. I believe that if anyone is to find a “cure” for their stuttering, it can be found in this book. You can find a link to a free copy online if you just google the book