Review (5/5): This stuff is SUPER messy and they warn you about that at least ...
This stuff is SUPER messy and they warn you about that at least ten times on the packaging and in the insert. It is however, the absolute best tooth whitener I've ever used. I saw results within three times of use and will definitely purchase again when this runs out. My advice is to NOT have your water running when you spit and don't spit, let it gently trail out of your mouth or it will spatter EVERYWHERE. It isn't anything a paper towel can't clean but it looks ominous. (It will also turn your toothbrush black so either buy a black one or store it out of sight!)