Teach your littles ones early on that oral hygiene is important and fun! Marcus and Marcus Kids Sonic Electric Toothbrush is your little ones first sonic toothbrush. The extra soft nylon bristles are cut in a convex shape for the best care and comfort of little teeth. The toothbrush will vibrate in 30 second intervals to indicate that its time to brush another part of your mouth. The vibrations are strong enough for a deep clean, yet still gentle enough for sensitive little mouths. The small rounded handle is designed to fit conformtably in little hands. Our Sonic Toothbrush is water-resistant and the brush heads are replaceable. Toothbrush requires one AAA battery.