Oral-B iO Series 10 Review: A Brilliant Toothbrush With a Battery Problem
It removes essentially all the plaque we could throw at it and coaches your technique better than anything else on the market. It also dies in three weeks and dribbles down your hand.
The best-cleaning electric toothbrush we've tested, sold at a price that only makes sense on discount.
The cleaning is not marketing
We scored plaque with disclosing tablets twice a week across three testers and nine weeks. The iO 10 posted a 9.2/10 — the best figure we have on record. The magnetic drive is quieter and smoother than Oral-B's older oscillating motors, and the round head still reaches the gumline in a way a sonic brush head physically cannot.
That number matters more than any spec on the box. If your dentist keeps flagging the same two spots, this is the brush most likely to fix them.
What 22 days actually feels like
Oral-B quotes around 22.5 days. We got 20 to 24, consistently, at two brushes a day. That is fine at home and irritating in every other context — it is not a two-week trip brush without also packing the charger, and the charger is a puck, not a USB cable.
Meanwhile the competition has moved. Several brushes at half the price run past 40 days. On a $399.99 flagship, this reads less like a trade-off and more like an oversight.
The dribble
This is a small thing that will define your relationship with the brush. The iO head has drainage holes near the neck. Water and toothpaste come through them, run down the handle, and pool in your palm. Every session.
It is not a defect and it is not a unit fault — it is the design. Reviewers keep raising it because there is no way to brush around it.
Who the coaching is for
The 3D app maps your mouth into quadrants and shows, in real time, where you have and haven't been. Two of our three testers had a consistent blind spot on the lower lingual surfaces. Both had fixed it within two weeks of using the display.
That is a genuine clinical benefit, and it is the only honest justification for this price. If you will open the app, this brush is worth it. If you will not, buy an iO 4 and put the difference toward a cleaning.
Product photography: Oral-B / retailer listing images.
- Scored 9.2/10 in our plaque-disclosure trials — the highest we have recorded from any brush
- The on-handle OLED gives real feedback without needing to prop a phone against the mirror
- The pressure light-ring is the single most effective gum-protection feature in the category
- App coaching genuinely fixed two of our three testers' habitual missed quadrants inside a fortnight
- 22.5 days of battery is embarrassing against rivals pushing past 40 at lower prices
- The head's drainage holes let water and paste run down the handle mid-brush — it is as annoying as it sounds
- $399.99 list plus $10-plus proprietary heads makes this one of the most expensive brushes to own, not just to buy
- The display electronics make the handle noticeably fatter and heavier than a Sonicare
You are paying a large premium for a screen. The cleaning performance is real and measurable, but a $60 Oral-B with the same round head geometry gets you most of the way there. The iO 10 is the version of that idea with a coach attached.
| Display | Interactive colour OLED on handle |
|---|---|
| Modes | 7 (Daily, Sensitive, Gum Care, Intense, Super Sensitive, Tongue, Whiten) |
| Pressure sensor | Visible light-ring, three-state |
| Battery | ~22.5 days per charge |
| Charge time | 3 hours |
| App | 3D tooth-by-tooth tracking |
| Head type | Round oscillating-rotating-pulsating |
| Water resistance | Shower-safe |
You just want clean teeth and don't want a device that asks you to look at it. The coaching is the product; if you won't use it, you're buying a $400 timer.
The verdict
The best-cleaning electric toothbrush we've tested, sold at a price that only makes sense on discount. At $279 the closest alternative worth weighing is the Philips Sonicare 9900 Prestige (~$300), and the honest answer is that the decision comes down to the trade-offs above rather than to any single number.
