Back in 2001 I went to a 3 week intensive course down in Virginia Beach. The goal was similar to another comment on this thread, retrain your brain on how to speak. We learned how to speak fluently with every sound and syllable as well as breathing “properly” (basically not taking short gulping breaths or giant deep breaths). I was 16 at the time, the therapy worked in the short term, but I did not continue to practice or keep in contact with the 7 other people I took the course with. The whole therapy was dependent on the group of us keeping in contact and practicing with each other for an extended amount of time. Needless to say my stuttering was back to where it was at before hand within a couple of months. 3 years later I decided to go to another intensive 3 week course that was in NYC, this course was based off the one I took in Virginia but had some variation. The program director was big on helping us desensitize our fear of stuttering. She would take us out into the streets of NYC and have us ask people for directions and stuff. We would also do cold calls to random business numbers using the yellow pages and ask questions like what their “hours” were. This was all combined with the same fluency techniques I had learned in Virginia. The other component of this was spot fluency, which was learning what to do when encountering a block in the moment. This course also relied on us practicing once it was over, but she offered a $20 group session every Tuesday for anyone who had taken the course. So for 3 years after I did the 3 weeks, I went every week and reinforced everything I had learned with others. I am thankful that I lived in the suburbs of the NYC and could do this. This course changed my life, not immediately but over time everything clicked and I went from a moderate to severe stutter down to a very light stutter within 5 years.