Why you are saying that no one uses them? I have a cousin that shared with me her experience with her boyfriend which has invisible braces and she was getting hurt almost every time when he wanted to pleasure her. She said they were using these dental dams not just for the hygiene buy also for protecting from such issues. It made me understand this better and I will think of it if I will have a boyfriend with braces. Well, I hope we will not have this kind of problems.