It was a waste of money. I used the 44% and it didn't do anything to whiten my teeth. I used it exactly as the instructions said. I guess it must be old. There was no taste to it like I expected. I will be purchasing another brand.

Definitely starting to see a difference… Definitely starting to see a difference in the colour of my teeth.. Have spent the last week perfecting how to apply this product so so carefully so not to allow it to come into contact with the gums as it burns so so badly. I have found that using a mouth guard (from a game of speak out) to open the mouth wide and applying the product to each individual tooth with a tiny brush the best way. Usually have to put cotton wool down the sides to avoid saliva running onto teeth. Works best with uv light and also 1 hour rather than 30 mins. I haven't found sensitivity a problem. Hope this review helps someone.

The Seattle has is over If you’re tired of searching for a whitening product only to be left disappointed at the poor results, then then look no further. This product will be the last whitening product you ever need to buy. It has a noticeable effect after just one use, and becomes more and more effective with every use thereafter. Fairly priced, arrives quickly and produces impressive results. I won’t buy whitening products from anyone else now.

The delivery time wasn't too bad… The delivery time wasn't too bad considering it comes from America. However, I've been using the system with the gels bought first (didn't know tray wasn't included so ordered tray separately!) For 2 weeks and not seen much difference unfortunately and that's with the 35%. I also keep reading that these led lights are a gimmick and wont actually help teeth whiten. Apparently it's got to be UV lights that work.

The product arrived in damaged package The product arrived in damaged package, after several weeks. The gel smells of pure bleach and it has burnt my gums and inside mouth after 1 use, used minimum amount of gel too as quite cautious. Contacted company on several occasions reporting the problem, with no response… Would definitely not recommend at all.