Mine is making your mouth wide while speaking. It works everytime, I only use this on my bad speech days. It doesn't stop your stuttering at all, it only reduces it in a great huge amount, I can express myself on what I want to say and it makes me happy and confident af. I discovered this thing in summer last year when I was having a random conversation with myself in the mirror, I'm home alone of course. You guys should go and try this thing out. I'm posting my experience on this subreddit soon to help y'all.