The Oral-B iO 4 offers the best cleaning experience from Oral-B with revolutionary Magnetic iO technology for a professional feel and gentle cleaning every day. iO is Oral-B's best cleaning technology, combining a unique round brush head with gentle micro-vibrations. An innovative linear magnetic drive focuses energy precisely where it's needed most – at the bristle tips. Experience a refreshing feeling of cleanliness and 100% healthier gums in just one week. The gentle cleaning and quiet operation ensure the best results from Oral-B from day one. It removes up to 100% more plaque compared to a regular toothbrush and leads to 100% healthier gums in a week. Inspired by dentists, the unique round brush head cleans perfectly with the help of micro-vibrations as well as rotating and back-and-forth movements. The cross bristles are angled at 16° and positioned to wrap around each tooth, achieving maximum cleaning and effective plaque removal along the gum line. The smart pressure sensor lights up red when you brush too hard and green when you are brushing correctly.