The Oral-B iO Series 9 has been our daily driver for three months, and it is the first electric brush in a while that genuinely changed the way our testers brush.
Why this brush stands out
The magnetic linear drive is the headline feature. Where older Oral-B oscillating heads buzz loudly and transmit vibration into the jaw, the iO 9 feels quieter and more controlled. Two of our testers with sensitive gums reported less morning soreness inside the first week.
Cleaning performance
In plaque disclosure tests after 14 days, the iO 9 left the lowest residual score across our review queue. The round head still reaches molar pockets better than the Sonicare oval head, and the seven modes cover everything from daily clean to tongue cleaning.
App coaching and pressure ring
The pressure ring lights white at the correct force, red if you push too hard, and green when you ease off. The companion app maps your mouth into six zones and grades your coverage. We found the offline coaching on the OLED screen alone was enough for most sessions.
Battery and travel
We charged the brush every other Sunday. The magnetic puck is small enough to throw in any toiletry bag, and the included case has a USB-A port that doubles as a phone charger. The case is bulky for carry-on travel.
Value
At $299 the Oral-B iO Series 9 Electric Toothbrush is the right Health & Personal Care in 2026.
Oral-B iO Series 9 Electric Toothbrush vs. the competition
| Product | Our rating | Price | Verdict |
|---|---|---|---|
| Philips Sonicare DiamondClean 9000 | - | - | Consider - Quieter and lighter, but lacks the iO pressure ring feedback. |
| Oral-B Pro 1000 | - | - | Consider - Budget alternative that covers the basics if you skip the OLED. |
| Quip Sonic Starter Kit | - | - | Skip - Underpowered next to the iO 9 and missing all coaching features. |
| Colgate Hum Smart Brush | - | - | Consider - Good app, weaker cleaning performance in our plaque tests. |
Full specifications
| Motor Type | Linear magnetic drive |
| Brushing Modes | 7 |
| Pressure Sensor | Smart Pressure Ring |
| Display | Interactive OLED |
| Battery Life | Up to 14 days |
| Charging | Magnetic puck |
| Warranty | 2 years |
Should you buy the Oral-B iO Series 9 Electric Toothbrush?
After 90 days of daily brushing, the iO Series 9 delivered the most consistent plaque removal of any electric brush in our queue. The magnetic drive is quieter than older Oral-B units, the OLED screen surfaces useful coaching cues, and the smart pressure ring genuinely helps stop overbrushing. Battery life held a full two weeks per charge. At $299 it is not cheap, but the package and clinical-feeling results put it ahead of every rival in the premium tier this year.
Frequently asked questions
Does the iO Series 9 work with all Oral-B brush heads?+
No. It uses the newer iO-series heads only, which click on magnetically and cost more than older Oral-B refills.
How long does the battery actually last?+
We averaged 13 to 14 days of twice-daily brushing per full charge, in line with the rated spec.
Is the app required to use the brush?+
No. All 7 modes and the pressure sensor work offline. The app adds coverage tracking and coaching.
📅 Update log
- May 14, 2026Refreshed Amazon price and confirmed brush head compatibility list.
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Priya Sharma
Priya Sharma writes for The Tested Hub.