My son introduced my husband and I to the RADIUS toothbrush in late 2009. At first, I felt like I was using a fuller brush on my teeth, but after just a few days, I got used to it and have used it ever since. I love my RADIUS and being left-handed, the toothbrush is much more comfortable to use than a conventional toothbrush. I would never even consider going back to a standard toothbrush. My teeth and mouth feel so clean after using my RADIUS. Thank you for making such a unique and useful product!