Distraction tools or anything for rhythm can affect my stuttering. DAF/FAF, metronome, auditory masking, speaking while someone else is talking (mirror neurons), but as you said, I’m not sure about the long-term effects. Even if I speak fluently with DAF, background noise can be a problem, and if there’s any psychological anxiety, it can trigger stuttering again. For example, when I take serotonin or when I am happy, I feel more relaxed.