I answered an online add and oredered tooth whitening sample and gave thenm a credit card number. They did not reveal that they would bill me monthly for supplies. My credit card company called me about abusive charges. When I called Dentech they said I agreed to monthly charges. I advised them they were lying and I wanted a cacellation and a refund. I had to report my credit number stolen to stop the billings. Apparently somewhere on the website is a hidden message indicating they will bill monthly. The average person will not know how to see this and will get scammed. The Credit Card company is being somewhat helpful but could do more read full review »