My understanding is that the clear plastic things don't work as quickly or solve as many problems. I have one of them for my retainer, which is quite a bit nic

My understanding is that the clear plastic things don't work as quickly or solve as many problems. I have one of them for my retainer, which is quite a bit nicer than the plastic and wire retainers of old. Of course, this was like 13 years ago, so I'm sure times have changed.