My sister bought my daughter an electric toothbrush for her first birthday, and she has been loving to use it every since! It's specially made for kids, it's pink and the stand it came in has fairy wings! I use it with baby toothpaste, which has very low fluride. In the evening, I brush her teeth while she's in the shower, (she showers instead of the bath) so she gets a good rinse there, and in the mornings, I just hold a towel under her chin and pour water into her mouth to rinse, most of it comes back out. I think it's important to only use a tiny bit of toothpaste. I also think that it's more important to form good oral hygeine habits early, and a tiny amount of low fluride toothpaste can't do much harm. My dentist has actually had to pull teeth from 4 year olds because of decay!
Ellie, NSW, DD 3 yrs & TTC # 2