I’ve tried many teeth whitening products but they all left my teeth feeling sensitive which can be quite painful! My friend has been using this brand for a couple of years now and I have never seen whiter teeth in my life !! She showed me this product a month ago and though I was a little nervous, I tried it straight away and was completely amazed by the results! I was able to use this product for the full 20 minutes comfortably and the results were immediate! Will definitely keep using this product and recommending it to everyone! 10/10!