Review (5/5): if you made a mess, you didn't read the instructions.
I am literally laughing out loud at the 1 star reviews where people complain about how messy this stuff is. If you read the instructions which are presented to you immediately after opening the box, and especially if you have access to other peoples reviews, there is absolutely no way you can make a mess with this stuff unless you yourself are throwing it everywhere.
I've just used it for the very first time and was most pleased to find there is indeed no taste at all! It's not like it tastes kinda bad but its tolerable... this stuff literally has no taste. Per the instructions, I put half a scoop on top of my damp toothbrush, over the sink and it worked perfectly. A small bit of the powder did fall off the toothbrush but it conveniently fell into the sink because I listened to the instructions.
I smoke and drink coffee so i've got legit stains to get rid of and after my 1st round I can truly see a difference! I'm not ready to be a Colgate model yet but having no problems with the process and seeing results on day 1 leaves me excited to continue using this product!!