The Oral-B iO 2 is the starter model of the iO series. These Oral-B toothbrushes have a soft brushing mode and soft bristles. This makes it a nice toothbrush when you first switch to electric brushing. The iO 2 has 3 different brushing modes. In addition to the standard brushing mode, you can choose from a sensitive and extra sensitive mode. When you live with another person, get a duo pack.