Product Information Product Size: 140 x 35mm Bristle Fitness: DuPont Tynex Recommended Age: 3 years old + Features Cleaning: 20 times more of an outstanding fine spraying effect than others Safe: Regular and smooth sonic waves Convenient: A compact grip feel to fit comfortably a child’s hand for easy self brushing Educational: 2 minutes auto-off timer for a recommended brushing time. Encouraging: Look inside the mouth by lightening up with white flash. How to use Parents should watch children not to keep holding the toothbrush in a mouth like a teether. Too much chewing a toothbrush may cause damage to the shape of washer rings, which results in brsistles pulled off. This fine head brush should be kept in a clean place without dust after use. We are not responsible for broken products and accidents beyond warnings above. Beware of poor imitations. Lifetime Replace toothbrush head when bristles spread apart or when they become hard and white coloured. Average lifetime is 3 months.