Yahoo should know that they recently ran an ad for Spark Whitening and Ivory Pro for a FREE trial offer. These were supposedly 2 different companies but they worked well together. I just had to pay postage. Well after 10 days I received the offer from Spark Whitening but it included the trial and a one month supply costing $95US. When I called, they said I had to cancel the one month order within 8 days of the trial order placement. Ivory Pro was the same except I didn't even get their order when they charged me - this is a MAJOR SCAM and Yahoo needs to get their ads off their site.