Oral-B iO Series 9 review: is Oral-B's flagship toothbrush worth it?

The Oral-B iO Series 9 sits near the top of Oral-B's iO range and is still one of the most recommended electric toothbrushes in 2026. It first launched in 2020 and introduced a new magnetic drive, a colour screen and a pressure sensor that warns you when you press too lightly as well as too hard. Oral-B, owned by Procter & Gamble, still lists it as a flagship model, and it keeps appearing in best electric toothbrush lists.

This Oral-B iO Series 9 review is based on the maker's specifications and published reviews from outlets such as TechRadar and Trusted Reviews. It covers the design, cleaning modes, pressure sensor, battery life, app, running costs and how the iO9 compares with rivals such as the Philips Sonicare DiamondClean 9000.

Design and what's in the box

The iO Series 9 looks like a sleek, slightly heavier version of a typical electric toothbrush. The handle weighs about 117 grams without a head, and Oral-B sells it in colours such as black onyx, white and rose quartz. There are only two buttons: one for power and one for choosing a mode. Below them sits a small colour display that shows the mode, battery level, the two-minute timer and a smiley face at the end of each session.

Depending on the bundle, the box includes the handle, a magnetic charging base, a charging travel case and one or more Ultimate Clean brush heads. The US bundle on Oral-B's site lists four refill heads. The travel case charges the brush while it is inside, so you can leave the base at home on longer trips. One thing to note: the charger is flat and magnetic, and it is not compatible with older Oral-B handles, so mixed households need two chargers.

Cleaning modes and magnetic drive

Oral-B calls its technology iO magnetic drive. Instead of the loud, rattling motor of older oscillating brushes, a magnetic system moves the round brush head and adds micro-vibrations. Reviewers consistently describe it as much quieter and smoother than older Oral-B models. Trusted Reviews measured a peak of about 63 dB, against about 82 dB for the older Genius 9000.

The seven modes cover most needs:

• Daily Clean for everyday brushing
• Intense Clean for a stronger feel
• Whiten for polishing surface stains
• Gum Care for gentle gum massage
• Sensitive and Super Sensitive for tender teeth
• Tongue Clean for freshening the tongue

Smart pressure sensor and brushing feedback

The pressure sensor is one of the best reasons to choose the iO9. A light ring around the neck glows in your chosen colour when pressure is right, turns red when you push too hard and shows a different colour when you press too lightly. Most rivals only warn about too much pressure. This matters because brushing too hard can wear enamel and irritate gums.

A timer buzzes every 30 seconds to tell you to move to the next quarter of your mouth. At the end, the display shows a frowning, neutral or happy face, so you get quick feedback without ever opening your phone.

Oral-B app and 3D teeth tracking

Pair the brush with the Oral-B app over Bluetooth and you get 3D teeth tracking that shows which surfaces you have covered while you brush. The app also lets you change the ring colour, set a custom brushing time and get reminders when a brush head needs replacing.

Published reviews agree the app is helpful but not perfect. Position detection can mix up areas, especially the back teeth. Trusted Reviews' tester, for example, rarely opened the app once the first few weeks had passed. You never need the app to get a good clean.

Oral-B iO Series 9 battery life and charging

Oral-B says the magnetic charger gives a full charge in about three hours, which is fast for an electric toothbrush. Reviewers report roughly two weeks of twice-daily brushing from a charge, though this depends on the modes you use. The display shows the charge level, so you are unlikely to be caught out.

The charging travel case is a real benefit for frequent travellers, since you can plug the case in and charge the handle while it sits inside.

Running costs and value

The iO9 costs more than most rivals, although prices have fallen a lot since launch and deals are common. The bigger long-term cost is brush heads: iO heads only fit iO handles and are more expensive than standard Oral-B heads. Dentists generally suggest replacing heads about every three months, so budget for that.

If you do not care about the colour screen, the charging case or seven modes, cheaper iO models use the same magnetic drive and round head. The iO9 makes most sense if you want every feature in one handle.

Who should buy the Oral-B iO Series 9?

The iO Series 9 suits people who want a premium brush with a very thorough clean, a quiet motor and feedback that helps them improve. It is especially good if you tend to press too hard, if your dentist keeps pointing at missed areas, or if you travel often. Budget buyers, and people who dislike the round oscillating head, will be better served elsewhere.

Key specs

Drive

iO magnetic drive with micro-vibrations and round oscillating head

Cleaning modes

7 (Daily Clean, Whiten, Gum Care, Sensitive, Super Sensitive, Intense Clean, Tongue Clean)

Pressure sensor

Smart sensor with light ring (too hard, too soft, just right)

Display

Interactive colour display

Connectivity

Bluetooth, Oral-B app with 3D teeth tracking

Charging

Magnetic charger (about 3 hours for a full charge, per Oral-B) plus charging travel case

Weight

About 117 g handle only

Warranty

2 years

Alternatives to consider

• Philips Sonicare DiamondClean 9000: A sonic brush with a longer head, a stylish charging glass and long battery life, though with less detailed real-time feedback.
• Oral-B iO Series 5: Keeps the same magnetic drive and smart pressure sensor at a much lower price, without the colour display and charging case.
• Oral-B iO Series 10: Oral-B's even more premium model, adding a charging base with a display, for people who want the very top of the range.

Frequently asked questions

The Oral-B iO Series 9 remains one of the best electric toothbrushes in 2026. It cleans thoroughly, runs quietly and gives feedback that can genuinely improve how you brush. The high price and costly heads are the main drawbacks, so look for a deal, or step down to a cheaper iO model if the display and travel case are not important to you.

How we research: Reviews are based on the maker’s specifications, published independent tests and owner reports. Scores compare the product with others in its class.