Please do not waste your time with this product. I purchased it and was so excited to have a white smile. The narrative provided at the back of the product is extremely convincing and sounds like it would work wonders. I came home and went on to Youtube – this is an international brand (I was watching reviews from the likes of Ireland and the States). Unfortunately, most of the videos I watch said the same thing. After 2 weeks they could see no visible difference. Don’t get me wrong, when you first remove the whitening strips and look in the mirror, it appears to have lightened drastically (or perhaps that’s just a placebo effect). However, give it a few hours and you will discover that there has been no or little change to the colour of your teeth. It made no long term improvement to my teeth or to a lot of the Youtuber’s.