You cannot cure a stutter for it’s not some kind of disease whatsoever. It’s a challenge or obstacle that hinders one from speaking fluently which can eventually be OVERCOME by different method. I give an example, my mom said she had a severe stutter growing up and the way she overcame it was by becoming a teacher, it wasn’t easy for her, stuttering in front of the students she taught and her fellows teacher, but she eventually overcame it through teaching and hasn’t stuttered in 30+ yrs. I have 2 sisters who stuttered too, one severe and the other one nearly noticeable, both of them overcame their stuttered in their mid 20s. I have a stutter but mine is barely noticeable, you wouldn’t even know I have a stutter unless you catch me angry which is when I have my blocks, asides from that I speak fluently. Everyone has to find their own way that works for them. Consistency is the key.