Do not use on children under age of 3. Replace brush head every 3 months or sooner if brush head becomes loose due to damage . All of the following Oral-B replacement electric toothbrush heads are compatible with the Oral-B Genius 8000 electric toothbrush: CrossAction, Deep Sweep, Floss Action, 3D White, Precision Clean, Sensitive, Dual Clean, Power Tip, and Ortho . A fully charged Oral-B Genius 8000 electric toothbrush with Bluetooth connectivity lasts for up to 12 days with regular use. The superior Lithium Ion battery delivers long-lasting, consistently powerful cleaning action between charges and the precise battery display accurately indicates when it’s time to charge. To ensure that the battery holds its maximum capacity, deplete it fully by using without in-between charges until it is fully discharged. Do this at least once every 6 months for best results . Position Detection helps you brush the way your dentist recommends by tracking how long you've spent brushing each area of your mouth. The Oral-B Genius 8000 toothbrush unlocks the enhanced Position Detection feature within the Oral-B smartphone app. This feature helps to ensure you never miss a zone. Using the Genius 8000’s innovative technology and your device’s camera, our brush helps you maintain healthy brushing habits