Teach your little ones early on that oral hygiene is important and can be fun! Marcus & Marcus Kids 2-Min Timer Sonic Toothbrush extra soft nylon bristles are cut in a convex shape for the best care and comfort. The toothbrush will vibrate in 30 second intervals to indicate that it's time to brush another part of your teeth. , , The vibrations are strong enough for a deep clean, yet still gentle enough for sensitive little mouths. Comes with 3 nylon bristles replacement head.