I had the professional whitening treatment several years ago, and I think it cost about $600. In addition I was given some additional "stuff" to apply to my teeth for another month to further the whitening process. Also, there is a maintenance chemical to help preserve the whiteness. The process works OK, but not to the degree I was hoping for. The older and more stained your teeth are the less dramatic the effect. Besides I am not willing to give up coffee and tea to preserve the appearance. Guess a handsome old coot like me has to have some flaw!