As you can see from this picture, the Sonicare brush is overall much larger, has a head that is similar in size to the manual toothbrushes, but what you can't see is that it vibrates significantly more than the rotary toothbrush (it will vibrate the toothpaste right off).

Since I have never used a Sonicare brush myself, I tried it first (when it was brand new and clean) so that I would have a better idea of what Chuck would be experiencing. Let me tell you, that brush makes your mouth tickle! I also learned from those that have regularly used this type of brush that it can cause some gum sensitivity in the beginning.

Taking these two things into consideration, I chose to start with Chuck's bottom teeth and only when he was very comfortable, move on to the top. My thought was that this would allow Chuck to become accustomed to the sensation of the brush, while minimizing any mouth sensitivity he may experience.