I was talkin to a friend of mine last night. She told me that at many tanning salons she's been to, they give you these things to put in your mouth that expose your teeth while tanning because the UV light helps to whiten your teeth? I have never heard anything like this. I'm wondering if this is just a ploy invented by our Fake 'n Bake happy society. Is there any validity to this or is she just getting ripped off?