For years, Oral-B's reputation rested on cleaning power rather than refinement — its brushes worked, but they buzzed harshly and felt a little agricultural. The iO range was the company's answer to that, and the iO Series 9 is where it all comes together. A new magnetic micro-vibration motor, a proper colour display and a genuinely useful pressure sensor add up to a brush that doesn't just clean well, but is a pleasure to use. That blend of performance and polish is exactly why it's our best overall pick.
Who is the Oral-B iO Series 9 for?
The iO9 is the right brush if you want the best clean available and you don't mind paying for it — ideally when it's discounted, which is often. It suits anyone upgrading from an older, noisier Oral-B who wants the same effective cleaning without the harsh rattle, and it's a strong choice for people who've been put off electric brushes by how aggressive they can feel. The pressure sensor makes it particularly good for anyone prone to brushing too hard.
It's less suited to buyers on a tight budget, or to anyone who simply wants a no-fuss clean and resents paying for an app and a colour screen they'll never really use. If that's you, the Oral-B Pro 3 3000 delivers the same core cleaning and the same pressure sensor for far less. The iO9 is the brush for people who want the best; the Pro 3 is the brush for people who want the sensible best value.
How the Oral-B iO Series 9 performs
Cleaning power
This is where the iO range earns its keep. The micro-vibration motor pairs Oral-B's familiar oscillating-rotating action with a gentle high-frequency vibration, and the result is a noticeably more thorough clean than older Oral-B brushes — teeth feel properly polished rather than merely scrubbed. It reaches the gum line and the spaces between teeth well, and in everyday use it's the most effective brush in our test.
The standout: the pressure sensor
The iO9's smart pressure sensor is the feature that genuinely changes how you brush. A light ring around the neck glows green when your pressure is right, white when you're too gentle, and red when you're pressing too hard. Because over-brushing is one of the leading causes of gum recession, this real-time feedback does more for your long-term dental health than any app ever could. After a week or two it retrains your technique almost without you noticing.
Noise and comfort
The iO9 is dramatically quieter than the classic Oral-B buzz — a smooth, low hum rather than a rattle — and it's gentler on the gums too. For anyone who has found electric brushes harsh or noisy in the past, this is a revelation. The colour OLED display shows the mode and a smiley face when you've brushed well, which is gimmicky but harmless.
Battery and charging
Battery life is around two weeks of twice-daily brushing per charge, and the magnetic charger is fast and tidy — a quick top-up adds a few days. It's not the longest-lasting brush here (the Ordo Sonic+ and Suri last far longer), but two weeks is more than enough for most people between charges.
The honest downsides: price and head cost
The iO9's drawbacks are about money, not performance. At full RRP it's hard to justify over much cheaper brushes that clean nearly as well — so you should only ever buy it on offer, where it drops to a far more sensible price. The other ongoing cost is the replacement heads: iO heads clip on magnetically and cost more than standard Oral-B heads, so factor that into the long-term running cost. Neither is a flaw in the brush itself; they're simply the price of the most capable model in the range.
