NYtoTN

I've been thinking that when it's time for my permanant dentures Id like to get the really white teeth. The ones I have now are called natural white and they match the remaining teeth that I have on the bottom. I have 6 teeth in front on the bottom with a partial and a full upper. I'd like to get the bottom teeth bleached so that they will match a whiter color denture.
My question is... Has anyone tried professional bleaching? Did it work? Can you tell me the approximate cost for professional bleaching?
I tried GOSMILE about a year ago when it was called Smile On The Go. It didn't make any difference in the color of my teeth. I called the company and they told me it was the same product. They just changed the name and added other products to the line. But the bleaching tubes didn't work for me. So I'm thinking of going the professional route.
Any suggestions?