Really good!
This kit is great, took me ages to decide wether to buy it or not as I didn't know wether I could even believe the positive reviews at such a low price! But the postage is really fast, the kits great comes with two sets of mouth guards, which can be reused, lots of syringes of gel which equate to a lot of uses!
At first I found my teeth to feel a little sensitive after use (however this went away as soon as I brush) but I now use this with Pearl dream drops (an over night whitening gel) and it has stopped all irritation completely!
I had very yellow teeth but they've defiantly improved already after a week or two of use, going to try use it twice a day and get them nice and white! It's really good value though so this kit is probably the one I will stick with ! Better than others I've tried!
Thanks!
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