TL;DR - Yes. Contrary to the conventional knowledge about stuttering, you can dramatically reduce the long-term severity of your stutter. Your brain adapts a certain way to Fluency-Shaping therapy. It can adapt in an even more radical way that is associated with a significant decrease in stuttering, though you will still stutter more than 0% of the time. The authors of this study didn't/couldn't pinpoint how this change happened, but it's possible. I've been doing some reading about this and came across some really interesting discoveries. So [this study](https://academic.oup.com/brain/article/132/10/2747/330765) - be warned, it's very dense - found that stuttering is primarily the result of a deficiency in grey matter in a specific part of the brain. They put stutterers and fluent people in an fMRI while they read short sentences off a screen. They found that stutterers who have not gone through speech therapy activate several parts of the right hemisphere of the brain that non-stutterers do not. However, after putting those same people through Fluency Shaping therapy, their stuttering decreased and their brain activated differently during speech. (Though raters rated their speech as "less natural" than when they were stuttering severely.) And finally, there are stutterers whose fluency has dramatically improved, to the point that the study calls them "recovered stutterers." They still stutter more than 0% of the time, they are still anxious about blocking, but much less than the other stutterers in the study. So there is hope. If we can figure out what caused the brain-change in the "recovered stutterers" we could dramatically decrease stuttering. Caveat: They found that stutterers with a larger deficiency in the part of the brain that caused stuttering generally stutter more, and were less likely to become "recovered stutterers."