Review (1/5): Don't buy this! Waste of money!
Worst purchase ever!! It's so messy, got all over my counters, and myself. It got stuck inbeteeen my teeth and flossing wasn't getting it out. I had to take a tooth pick and scratch it off. I had black on my gums, that wouldn't come off for two days, even after brushing numerous times. Just don't. I hated it! There is other whitening products that are a lot more useful then this garbage.