DO NOT WASTE YOUR MONEY....
DON'T waste your money...DOES NOT work to whiten teeth.  I used them for 2 weeks religiously without any result.  They left a thick residue on my teeth that was difficult to remove.  I threw the remaining product out.  I purchased them on the content of the reviews, if you do the same please heed my review and don't waste your money.
Rating: 1 stars