my mother is a watch/battery killer, but she had alot of shock treatments as a kid for Polio. How shock treatments make polio better is beyond me, but she survived it. She has a watch she wears around her neck. If she straps it on her wrist it runs backwards or dies. Never tested tooth brushes on her, she uses a manual one.

Maybe you can save money by getting a rechargeable one. I have a sonic care and love it. I plop it on the charger stand after brushing my teeth in the AM/PM and it holds a charge a long time. Mine also has a fancy box on it that you snap off the head and soak it in UV light to disinfect it. Tons of great choices for rechargeable ones.

Hmmm...I wonder if that is why the battery operated mouse dies constantly on my computer. those things last a year or so, but lately I cant keep batteries in it. makes ya wonder.