Oral-B CrossAction Toothbrush Heads have been developed with CleanMaximiser technology to advise when it\'s time change your toothbrush head for optimal brushing. This pack contains 4 individual toothbrush heads which are compatible with all Oral-B handles excluding Pulsonic & iO. Oral-B Cross Action Toothbrush Heads are designed with Clean Maximiser technology to turn the change the colour of bristles from green to yellow to indicate when it\'s time to change the toothbrush head to deliver optimal performance and the best clean. The bristles are angled at 16 degrees to target plaque and remove 100% more plaque than a regular manual toothbrush. These toothbrush heads are compatible for use with all Oral-B toothbrush handles except Plusonic & iO. Key Features of Oral-B Cross Action Toothbrush Head with Clean Maximiser Technology Clean Maximiser Technology for optimal brushing Targets plaque all over tooth surface Bristles angled at 16 degrees to reach deep between teeth Compatible with all Oral-B handles excluding Pulsonic & iO