There are several mentions of sonic toothbrushes in AngieM2's dentist visit thread. I had never heard of them, or had dismissed them as "just" electric toothbrushes. These sound like something I'd want to look into. My teeth and gums are healthy, and I'd like to keep them that way. So, tell me--which brand of sonic toothbrush do you use? What do you like about it? What do you dislike about it? How often do you have to change the brushes or batteries? All input welcome.