Maybe try a short pencil or something, so you can keep your mouth closed.
I do not think this will work. The theory is that holding the pencil in your teeth contracts the same muscles you use to smile (zygomaticus major, risorius). If you can keep your mouth closed, these muscles will not be affected in the same way. I think any other object that is long enough should work. I use a mechanical pencil.
I am happy my idea made you happy!
I do not think this will work. The theory is that holding the pencil in your teeth contracts the same muscles you use to smile (zygomaticus major, risorius). If you can keep your mouth closed, these muscles will not be affected in the same way. I think any other object that is long enough should work. I use a mechanical pencil.