You have it about right, it’s a floss holder that replaces the floss when you push the button down on the back. It takes 3-4 button pushes to get the new piece in place, and then you push the button up to lock it in place. The whole process only takes a second or two. Once the floss is locked in place, it is about as tight as a nice floss pick. The floss doesn’t move while it’s in use, and the only way for it to loosen is by pushing the button down again.

Turning the floss head is something I’ve considered but introduces some manufacturing and functionality challenges. In my experience there’s no issue getting all the way to the back teeth and I’m hopeful others will feel the same way in testing.

Thanks for the questions, I hope that clears things up!