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Home / Health & Wellness / Electric Toothbrushes / iO Series 9
8.9 Tested Aug 22, 2026 by Team RankingRight

iO Series 9 (Oscillating, 7 modes, colour display) review 2026

Oral-B's flagship: a colour screen, seven modes, 3D tracking in the app and a magnetic charging case — the same 88% clean as the Series 5

PriceFrom $300 · checked Sep 11, 2026
Plaque removed88 %
Battery14 days

Is the iO Series 9 Worth It?

Most advanced. The Series 9 is a lovely object and its app coaching is the best there is. It cleans exactly as well as its $100 sibling, which is the fact that decides it.

iO Series 9 Pros & Cons

Pros
  • 88% plaque removal — tied for best
  • App tracks all 16 zones in real time and our testers improved measurably
  • Magnetic charger; power-bank travel case
  • Interactive colour display
Cons
  • $300 for the same cleaning as the $100 Series 5
  • iO heads about $8 each
  • Seven modes is five more than anyone used

iO Series 9 at a Glance

8.9 Editor Score
Cleaning performancePlaque reduction measured with disclosing tablets across six testers, and along the gumline specifically.
34/35
Comfort & pressure controlNoise, vibration in the hand, pressure sensor behaviour, gentleness on gums.
18/20
Battery & buildDays per charge at two minutes twice a day, charger type, water resistance, travel case.
13/15
Replacement head costPrice per head at the recommended three-month change, and availability of third-party heads.
9/15
Modes & appBrushing modes, timers and pacers, and whether the app coaching changed our testers' coverage.
15/15
Reader ratingNo reader ratings yet — not part of the score
–
Own one? Rate it:

Rubric v1: Cleaning performance 35 · Comfort & pressure control 20 · Battery & build 15 · Replacement head cost 15 · Modes & app 15. Score = Σ ÷ 10, locked Sep 11, 2026. How we rank.

Where to buy — prices checked Sep 11, 2026

Amazon — $300

Best priceSee Price

iO Series 9 specifications

TechnologyOscillating
Modes7
Pressure sensorYes (light ring)
Battery (our test)14 days
Head cost (each)8 USD
AppYes, 3D tracking
ADA SealYes
Plaque reduction (our test)88 %

Why it scored 8.9

The Series 9 is a lovely object and its app coaching is the best there is. It cleans exactly as well as its $100 sibling, which is the fact that decides it.

Where it loses

Value.

Still the right pick for

Gadget lovers who will use the app.

iO Series 98.9 · $300
See Price