A big difference
Size ordered: Small
This device is for my Husband. It does not completely keep him from snoring, but at least he doesn’t sound like a bull dozer in the middle of the night anymore. This is his second mouth piece. The first one lasted a very long time. Over a year. He did say this one is a little bigger than the first one we ordered.
I would definitely recommend giving this a try if you sleep with someone that snores!!’