Review (4/5): Good but could be better
This kit is just what I needed. It was a great price, too! Especially compared to having to pay out the yin yang from the dentist for whitening gel and custom whitening trays. The gel is very gentle on gums and teeth but does whiten. I would like to see more improvement per treatment but I have bad staining from not taking care of my teeth at all for 8 or so years and smoking 2 packs a day on top of it. I did quit last year though but still had massive yellow staining.
The kit comes with boil-and-bite trays which worked great for my top teeth but not so well on my bottom teeth as I have crowding in the front. But those trays were good to use while I waited for the custom trays to arrive at my doorstep. The kit also comes with 3 sets of impression material each set has blue and white material that you mix together quickly and then put in the plastic trays and you bit down on them and hold them steady for 4 minutes till it's set firm. Then you rinse the molds and mail it with the prepaid and pre-addressed envelope to ProWhite. It took exactly 2 weeks to send and receive them. I did get an email from GreenDot (the seller) saying that my trays were done and were mailed, which was nice.
The 22% carbamide peroxide that makes up the whitening gel is very gentle on gums. I've tried another product which was a generic off-brand of aquafresh white trays and it burned the HELL out of my gums. Oh it was awful, but this stuff doesn't even burn or cause any stinging which is wonderful! I leave my trays in for 30 minutes to one hour and see a noticeable difference in the whiteness of my teeth after every treatment. Not a huge difference but it is noticeable.
The custom trays could have been made better. I checked my molds and actually re-did one of them because the gum line wasn't right, wasn't clear enough in the mold material. The custom trays are not cut along the gum line but above the gum line in a straight line. I've heard that doing that helps keep the trays on your teeth better than those cut along the gum line. The trays are very flexible. The gum lines aren't perfect on the trays making me think that the person who poured the stone into the mold didn't do it well enough or something, but to be honest you get what you pay for... A price this good will have some setbacks. I did get to keep the stone molds of my teeth though. They came in the envelope with the trays on the molds. Cool.
Anyway, all in all this has been a wonderful experience. I would buy this kit again if I needed to, I highly recommend it.