You know, this is just one of those things that is going to sit on my mind and my ego forever! I bought a two pack of toothbrushes several months ago and have been using mine now for a couple of months. I noticed the handle was a little thicker than my other one, but not much, what I never noticed though was the two little buttons that blend in really nicely with that handle. One is a plus sign and one is a minus sign, the toothbrush vibrates! My son is having trouble finding a toothpast the likes that doesn't burn his mouth, especially now that it is cut up from the baseball. He came in and asked about using baking soda so I told him where it was and he got it,, then he said to remind him not to turn on the toothbrush before he put it in his mouth! So I asked him turn on what?? He pointed out the two pack of brushes I bought vibrated and I felt like a real idioit,,,,, I've been using it for months and never knew it did that..... Nothing like a 17 year old to point out the rattlesnake in your hand!