An electric toothbrush is more efficient than a regular toothbrush. It's battery-powered so you don't have to mess with any cords, and the brush head moves in rotating movements.
From OnBuy
Oral-B Stages Advanced Power Disney Frozen Kids Childrens 3+ Battery Toothbrush
Vitapoint Health & Beauty
Oral-B Stages Disney Frozen Kids Electric Toothbrush with Battery and Timer App