iO Series 5 (Oscillating, 5 modes) review 2027

What problem does the Oral-B iO Series 5 solve?

The iO Series 5 is for anyone who wants the cleaning result of Oral-B's flagship without paying flagship money. It removes 88% of plaque in our test, tied with the iO Series 9, and it tells you when you are pressing too hard. The verdict is blunt: it cleans as well as Oral-B's flagship and has the pressure feedback that matters. The one running cost is iO heads, which are pricier than classic Oral-B heads.

That is the whole case. You get the same measured clean as the $300 brush, a light ring that shows too much, too little and just-right pressure, and a travel case, for $100. It is noticeably quieter than older Oral-B brushes and runs two weeks per charge. Most people should buy it.

How did it score in our tests?

We scored it across five criteria, and the points show exactly where the money goes.

• Cleaning performance: 34 out of 35. We measured plaque reduction with disclosing tablets across six testers, and along the gumline specifically. The Series 5 removed 88% of plaque, the highest score in the test.
• Comfort and pressure control: 17 out of 20. We judged noise, vibration in the hand, pressure sensor behaviour and gentleness on gums. The light ring works, and the brush is quieter than older Oral-B models.
• Battery and build: 12 out of 15. We counted days per charge at two minutes twice a day, and checked charger type, water resistance and the travel case. It lasted 14 days and ships with a case, but the plastic body feels less premium than the Series 9.
• Replacement head cost: 11 out of 15. We priced heads at the recommended three-month change and looked for third-party options. At $8 each there is no cheap alternative.
• Modes and app: 12 out of 15. Five modes, timers and pacers, and app coaching that is basic on this model.

Total: 8.6 out of 10, third of eight electric toothbrushes tested.

Where does the iO Series 5 stand out?

The measured clean is the headline. At 88% plaque removal it ties the iO Series 9, a brush that costs $300, and beats every Sonicare in the test. The pressure light ring is the second strength: it shows red, green and white so you can see too much, too little and just-right pressure without guessing. Testers also noted it is noticeably quieter than older Oral-B brushes, and the 14-day battery matches the Sonicare DiamondClean 9000 and ProtectiveClean 6100. A travel case is included.

How does the oscillating technology work?

Oscillating brushes use a small round head that rotates back and forth rapidly around each tooth. The iO range adds a magnetic drive, which transfers that motion without the mechanical clatter of older designs. The result is a controlled sweep that cups the tooth and works along the gumline. A pressure sensor watches how hard you push and signals through the light ring. That is the mechanism; the numbers above are what our testers measured with it.

What is it made of, and what comes in the box?

The spec sheet is straightforward. Technology: oscillating. Modes: 5. Pressure sensor: yes, a light ring with red, green and white states. Battery: 14 days in our test. Head cost: $8 each. App: yes, the Oral-B app. ADA Seal: yes. Plaque reduction: 88% in our test. The body is plastic, which is where it feels less premium than the Series 9, and the travel case is included.

How does it compare with the other brushes we tested?

Against the iO Series 9 ($300, 8.9), the Series 5 gives up the colour screen, two modes, 3D tracking and the magnetic charging case, but matches the 88% clean and the 14-day battery. Against the Sonicare DiamondClean 9000 ($230, 8.8), the Series 5 wins on plaque removal (88% vs 85%) and head cost ($8 vs $10), while the Sonicare offers four modes with three intensities and a coverage-map app. Against the Sonicare ProtectiveClean 6100 ($110, 8.4), the Series 5 cleans better (88% vs 83%) and matches the $8 head cost, but the Sonicare has three modes with three intensities and no app. Against the Sonicare 4100 ($50, 8.3), the Series 5 wins on plaque (88% vs 82%) and modes, but the 4100 has cheaper heads at $7. Against the Pro 1000 ($50, 7.9), the Series 5 cleans better (88% vs 84%) and lasts longer per charge (14 days vs 10), but the Pro 1000's heads cost $4 each.

Where does the iO Series 5 fall short?

Head cost is the loss. At $8 each, iO heads are pricier than classic Oral-B heads and there is no cheap third-party option. The app coaching is basic on the Series 5, so you are not getting the 3D tracking of the Series 9. And the plastic body feels less premium than the Series 9. None of these affect the clean, but they affect the running cost and the feel in the hand.

Is the iO Series 5 good value at $100?

At $100 it is the cheapest route to an 88% plaque score in this test. The trade is the head price: $8 each against $4 for the Pro 1000 and $7 for the Sonicare 4100. If you change heads every three months, that is the cost you carry. If you want the same clean as the $300 Series 9 for a third of the price, this is where the value sits.

Who should buy the iO Series 5?

Most people. If you want the highest measured plaque removal in our test, a pressure light ring that actually tells you something, a quiet brush and a travel case, the Series 5 delivers all of it for $100. Skip it only if head cost is your deciding factor, in which case the Pro 1000 at $4 per head is the cheaper habit.