Not 100% sure yet!
I have used it a couple of times…. The tubes of gel were pure runny liquid so my first attempt was not very successful. But it came with a large syringe of peroxide gel so I used it the second time with better results. However, the difference was minor. I don't know if the thickness of the trays keep the light from penetrating or what. I also did not like that there were no directions included. You are referred to the website to watch a video but it still doesn't tell you how often you can safely use the product. We'll see how it goes….
Rating: 3 stars