Oral-B TriZone offers a cleaning action on 3 zones to remove plaque, and even between teeth compared to a classic manual toothbrush.<br /><br />- A mobile tip to reach back teeth.<br />- Short strands to clean the external side of teeth<br />- Longer strands to reach interdental spaces.<br /><br />It has a system indicator which indicates use, blue strands that get lighter after 3-4 months of use.