SCAM! DO NOT TRY

I filled out some kind of survey on line and "won" a FREE supply, just had to pay shipping charge of ~$3.85 charged to my MC account. No conditions, just a good deal. Got three tubes, then got my MC statement with a charge of $94.31.

They claim their terms and conditions required me to "cancel my subscription" within eight days or I would be set up to automatically keep receiving this crap. There were no such conditions mentioned. I called to dispute their charge after some time was told I could get a 60% refund. I said to set that up, but I still wanted a full refund. After some argument, I was told they would send me an email with return instructions and that if I returned the stuff, they would give me a full refund. I received the email and sent back what I had left, with their RMA number on the outside.

I also received an email: Thank you for contacting Customer Service. This email is being sent to inform you that your order has been cancelled. You will not receive any other shipments or charges from Spark Whitening

From what I experienced, this crap is ineffective and purely a scam with a deceitful come-on.