I love that these are tested for no pfas and this was my first time mouth taping. I have heard about some of the benefits but I was curious more about the sleeping experience. I've used these now for 10 days, only not using one day to test and I can say hands down that my sleep is SO much better. This is like melatonin in a little strip. My husband is now also obsessed. These are flexible and you can breathe easilly or talk if needed when placed in the I shape. They stay on after chapstick and on a beard too! Incredible