I used Opalescence (same stuff as ruski) and it worked very well. It cost around $200 (I think a bit less actually) and the results were very good and lasted a long time. Unfortunately, I had to get braces for a second time, and all the time and money I spend whitening went down the shitter... I think I'm going to try in-office whitening next time around because it's much faster and easier. The oneb bad thing I will say about Opalescence is that it's a mild pain in the ass - just another thing you have to add on to the bedtime routine that makes it take longer to get to bed.