This was my first time using this type of product, or any type of whitening product for that matter. It was very exciting! The 2 step process seemed a little trying at first, using each tube of paste or whitener for 1 minute apiece. If you're in a rush, 2 minutes of brushing can be killer but it was worth it. Before long, it was just part of our daily routine. I found that I gave more attention to my brushing with Crest Pro-Health HD. The taste and feel of step 1, the paste, was a little different. Like any new toothpaste, it's something you get used to. Not rinsing before using step two, the whitener, was sometimes a little gross. It was worth it and you get used to it before long. My teeth felt great and looked great. The whitening could have been more noticeable. I didn't notice a huge difference in colour but some. All in all, we've enjoyed using it and probably would buy it again, if the price was reasonable. All in all, a great product!