This company targets people through ads at different websites, for example, I just saw its ad on NewYork post's website describing how a Mom turned her yellow teeth to white for just $4. Before you decide to take advantage of this great offer, do not forget to carefully read the terms and conditions posted on their website. In order to avoid around $150 charge on your credit card you must cancel within x number of days after placing the order (not from the day you actually receive it and it arrives just before the day that period expires) otherwise your credit card will be charged. Even if you call and face their rude customer service and cancel the future charges you would not be able to reverse the charge. How do I know, I know because I was one of those who did not bother to read the terms ...on top of that the product is worthless in my opinion ... it is not FDA approved and made only a minor difference to my teeth which quickly disappeared when I stopped using the product.