Oral-B iO9

Our verdict

Buy the iO9 if you want the app to show which surfaces you keep missing and you will actually brush with it open, or if you travel often enough that charging inside the case is worth paying for. Otherwise the iO3 or iO2 is the better buy: the same brush heads and, according to Oral-B, the same cleaning action, with a timer and simpler pressure feedback, at a fraction of the price.

If you already own an iO9 and it works, keep it. We found no evidence that a newer iO would clean better, heads are widely sold and every iO head fits it.

Which model this is

The iO9 is the second most expensive brush in Oral-B's iO range, below the iO10. Oral-B sells it in several colours, including Black Onyx, Rose Quartz and White Alabaster, and in bundles that differ in the number of brush heads and accessories. This review covers the standard bundle with the charging travel case and magnetic charger. Check the box contents before buying, because some listings add heads or a pouch and others do not.

It is current, not discontinued. On 29 October 2026 Oral-B's own UK shop was selling it for £200 to £215 depending on the listing, and Boots listed it at £250 but showed it as temporarily unavailable online. Oral-B brushes are discounted often, so the price on any given day can be very different.

What the extra money buys

Oral-B says every iO uses the same round head, oscillating-rotating movement and micro-vibrations, and its UK range guide says the clean on its entry models matches the top models. That is Oral-B's claim; we found no independent trial comparing iO models with each other. The research below is about types of brush, not particular models or features.

A Cochrane review that pooled 51 trials found that powered brushes reduced plaque by 11% over one to three months and 21% beyond three months compared with manual brushes, with the most evidence for oscillating-rotating designs like Oral-B's. Its authors said the clinical importance of the difference was unclear, and the NHS says electric and manual brushes are equally good if you clean every surface with fluoride toothpaste, though some people find an electric brush makes that easier.

A 2026 analysis of 19 trials, which Oral-B also cites, ranked oscillating-rotating brushes first for plaque and gum inflammation, ahead of sonic brushes. None of these trials tested displays, extra modes or app tracking.

Prices are sale prices on the dates shown and change often.

The pressure feedback is the main difference at the bottom of the range. The iO2 only warns you when you press too hard. From the iO3 up, Oral-B's light ring also shows green at the right pressure and white when you press too lightly, which helps if you tend to ease off too far. Oral-B says the iO9 and iO10 add Smart Adapt Mode, which adjusts the brush to the way you brush as you go; we found no independent test of it.

So the iO9's real advantages are three things:

• 3D tracking. The app shows the front, top and back surfaces of your teeth and which you missed. This is useful if you suspect you rush one area, and only while you brush with your phone nearby. The brush works fully without the app.
• Seven modes. Daily Clean, Sensitive, Super Sensitive, Gum Care, Whiten, Intense and Tongue Clean. Most people use one or two. The sensitive modes and Gum Care are the ones most people have a reason to use, and the iO6 already has Gum Care.
• The charging case and fast charger. The magnetic charger fills the battery in about 3 hours. The case charges the brush inside it, which is the extra that saves packing the stand.

Charging and battery

According to the iO9 manual, a full charge on the magnetic stand takes about 3 hours. When the battery runs low, the motor slows and the pressure light briefly flashes red. Once it has run out, a 5-minute charge gives one clean; if the display has gone off completely, Oral-B says to charge for at least 30 minutes. You can leave it on the stand, because the brush stops charging when full.

The charging travel case uses its own power supply, rated for 100 to 240 volts, and takes about 6 hours to charge the brush. You may need a plug adaptor abroad. Oral-B does not give a battery life in days for the iO9; an independent review by Notebookcheck got at least five days of twice-daily brushing from a full charge.

The battery cannot be replaced: opening the handle destroys it and voids the guarantee, so when the battery eventually fades the handle has to be replaced.

Brush heads and three-year cost

The iO9 takes iO heads only. Oral-B says every iO head fits every iO handle, from the iO2 to the iO10. The older Oral-B heads used on the Pro, Vitality and Genius brushes do not fit. Ultimate Clean is the everyday head and Gentle Care is the softer option for sensitive gums. Oral-B advises a new head every 3 months, or sooner if the bristles are worn, and the colour of the indicator bristles fades as a reminder.

On 29 October 2026 Oral-B's shop sold a 4-pack of iO Ultimate Clean or Gentle Care heads for £25, shown as an offer beside a crossed-out £53.99. Superdrug listed a 4-pack at £19.99 for collection in store, and Tesco at £20 with a Clubcard.

Here is the cash needed for three years at Oral-B's shop prices on that date, replacing the head every 3 months. That is 12 heads in all; the brush comes with at least one, so you need 11 more, which means buying three 4-packs at £25 and keeping one spare. Delivery charges are not included.

Head prices move a lot: on the same day the same 4-pack ranged from £19.99 to £25 depending on the shop, and Oral-B showed £25 as an offer price.

Whichever iO you choose, the heads cost the same, so buying them on offer matters almost as much as which handle you pick.

Guarantee and support

Oral-B gives a 2-year guarantee from the date of purchase. Oral-B UK stopped its optional extra year of cover for brushes bought after 26 September 2026, so registering a new brush no longer extends it. Brushes bought before that date can still be registered for a third year, and brushes bought from Oral-B's own shop before then had three years automatically. Keep your receipt. Repairs and replacements in the UK are handled by Oral-B's service partner, and the guarantee does not cover normal wear and tear or damage from misuse.

Who should buy it

• Choose the iO9 if you want surface-by-surface tracking and will use the app, or you travel often and want to charge in the case.
• Choose an iO2 or iO3 if you want Oral-B's iO cleaning action, a timer and pressure feedback. You lose the display and app tracking; with the iO2 you also lose the green and white pressure light.
• Look at the iO6 if you want a display, Gum Care mode and a travel case for less than the iO9.
• Compare a sonic brush such as the Philips Sonicare ProtectiveClean 4300 if you prefer a conventional-shaped head. The 2026 analysis ranked sonic second to oscillating-rotating, and both outperformed manual brushes in the trials it pooled.

During aligner treatment

The travel case is the iO9 extra most likely to matter if you wear aligners, because you need to brush before each tray goes back in, including at work or away from home. Keep the iO9 for your teeth only. Trays are cleaned separately, as described in our guide to cleaning aligners.

How this review was put together

This review is based on Oral-B's specifications, the iO9 manual, published research and retailer listings checked on 29 October 2026. We did not retest the brush for this update. The photo is from the original 2020 Aligners.co review. See more electric toothbrush reviews.