I purchased a trial sample of teeth brightener for $1.49. I immediately cancelled when I received the shipment. Natural Source proceeded to take FOUR exhorbitant payments (over $400) from my checking account with no authorization from me using the numbers I had supplied to receive their sample. You cannot e-mail this company to cancel and it is difficult to contact them by phone. In addition to taking the deductions, I never received any products other than the trial shipment! read full review »