Dr. Fresh Light Up Firefly children's toothbrushes are designed to increase brushing compliance in children, helping create good oral habits at an early age. The built-in toothbrush light flashes for 60 seconds, the dentist recommended time for proper cleaning of each row of teeth. Kids should brush top row of teeth until the light stops flashing, then repeat for the bottom row of teeth. Batteries are included and non-replaceable, when the light no longer flashes, it is time to change your brush (about 3 months). Pack of 12 includes four white brushes, four red brushes, two blue brushes, one green and yellow brush. Get your kids brushing today with Dr. Fresh Firefly flashing toothbrushes.