What a complete waste of time and money. I had this done at the Professional Beauty North show in Manchester and had to sit with an uncomfortable gumshield in while everyone walked past looking at me. After spitting into a bag afterwards (ewww!) I was told how amazing my teeth were now, told that I would need it again (!!!) then sent on my way.
Got home and they had already started to dull down and within a few days they were back to normal.
It might be "peroxide free" but it is also "lasting-results free".
Would not recommend at all.
Reason of review: Not as described.