Very good80/100
- Great brush performance
- Pressure sensor
- Timer for brushing
- Not a good choice for sharing
- 12 to 18 hours charging time
- Two weeks battery life
The iO Series 4 has the same great brushing performance as Oral-B's other iO models - and at a lower price. However, it has a few quirks that make it unsuitable for sharing with multiple people in a household. Also, the iO Series 4 is not a good choice for people who don't want to control it via app.