Review (4/5): The trays alone are worth buying this kit
In researching teeth whitening products on Amazon, it quickly became clear to me that a custom teeth whitening tray would be the best solution. My teeth are straight enough that my parents and I decided against my getting braces as a child, but they are crooked enough (especially my mostly-hidden bottom teeth) that I worried other whitening products (like white strips) would not whiten evenly.
I went out on a limb and ordered this kit. At the time it was only $50 on Amazon. It came packaged as reported. I took my teeth impressions, the process was pretty easy, and sent them off to the lab in the pre-paid envelope. Then I crossed my fingers. I had every confidence that the initial package would arrive since it had the backing of Amazon, but I was a little dubious sending my impressions off to some random lab that's not affiliated with Amazon. I had decided just to wait until I got my customs trays to start using the whitening gel, rather than mess with the boil and bite trays.
Well, it was over a month and I was beginning to lose hope that my teeth trays would ever come, when I got an email that my trays were on their way! I had no idea when I ordered this kit how long the trays would take, and I don't think a month or two is an unreasonable amount of time to wait... so that's why I'm writing this review, to let customers know that they should be prepared to wait several weeks for the trays to arrive. But they do arrive! And I'm very happy with the result. The fit is precise and snug.
As for the 22% gel... I've been using it for about three weeks now, roughly 20 minutes to 30 minutes a day. It appears to have made my teeth brighter... not sure if it's made them all that much whiter. I'm a big coffee and tea drinker, so this gel is up against a lot of persistent staining. Looking up close in the mirror, I still see the yellow cast of my teeth stains, but the enamel underneath appears brighter. I'm probably going to try the 35% gel after I'm done with the gels that came with this kit.
But that's okay, because I have custom trays, now, and even if the gel they came with isn't sufficient, the trays (which, as I understand, would have cost a few hundred dollars from a dentist) are worth the price of the kit. Now that I have them I can order any gels I want from Amazon.