The Firefly Toothbrush that blinks for one minute at a time. Of course, in typical American consumer culture, there were Barbie and Hot Wheels varieties available, too. But I thought the light up factor was special enough to please my kids. And for $1.02 each, it's even a great price for a toothbrush, period!
Now the girls brush their teeth for one minute in the dark, then mom or dad check their teeth for another minute. It's kind of freaky seeing their cheeks and nostrils illuminated in red, but if it keeps them brushing, I have no problem with it.
A little added bonus: the dentist has recommended that my oldest use a fluoride rinse every evening, and according to the directions on the bottle, the child should swish for an entire minute. So now my daughter doesn't have to trek back and forth to my nightstand to observe my alarm clock, she can just reset the Firefly and after one minute, she's done.