It WORKS!
I bought this for my granddaughter and I found that she was adamant about NOT wanting this put on her, so I KNOW it worked!  Later found the tube hidden in a drawer because she didn't want it on, so I KNOW FOR SURE, it works!  As I type this, I JUST realized that I have NOT seen  a thumb in her mouth for over 2 weeks!
Rating: 5 stars