I am convinced it does. I have seen hundreds of people cured themselfs of stuttering. The problem is only that to all the main speech therapistst are not so keen to accept new Concepts in science. They all thinking based upon what they have learned. It makes me So angry that a lot of people in the field of stuttering are propagating that stuttering will always be part of you and you need to accept it. This is really a crime in my opinion. People have the right to know that if they want to get rid of their stammer that this possibilty exists. Its really based on evidence this method. I dont know of any other method that has this kind of sciense to back up their therapy. The Del Ferro institute always invited the people in the field to come and take a look and see how peoples life change and what their working method is all about. You know what always happend? For the most: no one wanted To even come to mr. Del Ferro and they laughed in his face when he presented his research. That people are almost psychopaths because if you are really emphatic you want the help the stutterers with curing them even if it means that somebody else will erase all the things you have learned if it proves to cure. Mr del ferro actually gave up is operasingers carriere (he was worldfamous red.) because the feeling he got from curing little kids of their stammering was soo good to him that he was really convinced that the fame he could achieve never ever could mimic the feeling he got from helping people to overcome their stuttering and giving them their life back. He passed away in the 90ts but thank god his daugther took over and owns the institute. See is always on TV with ex-stammerers. we even have a dutch member of the parlement who got rid of her stammer when she was a young girl. See here talking now in Politics! ⬇️ https://youtu.be/J_Sf0X2w2cc