Go Smile is one of those many teeth whitening products out there that I have bought. And I have to say, I think it works, although I only used it for a little while, but what I don't like about it is that you have to use the gel on your teeth without a tray or a band. You just spread it on and leave it. I feel that this isn't the best way to whiten, but what do I know, you tell me. It's pretty popular though. But there are so many out there. I just bought rembrandts teeth whitening kit and that comes with a try you are supposed to soak the trays in hot water and it forms to your teeth. But it didn't for me. I think the strips are the best. Although back in the day I had a professional kit that was made at my dentists office and they molded a tray for me and it worked like magic. I forget what it was called and I have lost the tray. But the best way is through your dentist I think. Tell me your opinion. Here is what is said about the Go Smile Product: ADVANCED Formula B1 Tooth Whitening On The Go
What it is:
Professionally formulated by Jonathan B. Levine, D.M.D., New York City, this proprietary teeth whitening ampoule technology and advanced formula is the most effective, simple, hygienic, truly on-the-go, convenient way to whiten your teeth - no fuss, no mess.
What else would you expect from the #1 tooth whitener company at Sephora?

What it is formulated to do:
-Whitens natural teeth optimally and safely lifts stains from porcelain crowns and veneers too.
-This advanced formula's unique gel polymer increases in potency upon contact with teeth and remains on for 20 minutes for optimal results.
-The soft brush tip lets you gently target specific teeth to customize your whitening.
-Proven not to damage tooth enamel.

Clinical Testing/Results:
Clinically proven to whiten your smile 4-10 shades in seven days depending on your starting shade.