Oral-B iO Series 9 review

The iO Series 9 is Oral-B's most advanced brush, and it is the opposite of a no-frills pick. Oral-B lists 3D Teeth Tracking with position detection that maps each tooth surface in the app, an interactive color display that coaches you during the brush, and a Smart Adapt mode that Oral-B says learns your habits and adapts up to 10 times per second. There are 7 Smart Cleaning Modes, including Gum Care, Super Sensitive and Tongue Clean, plus a visible pressure sensor and a 2-minute timer with quadrant pacing. The box is generous: four iO Ultimate Clean heads, a Power2Go charging travel case and a magnetic charger. The regular price is $329.99, with $279.99 on sale in November 2026. The core cleaning, the iO motor, round head and pressure sensor, is shared with the iO Series 5, so most of the extra $210 buys tracking, the display and accessories. Buy it only if you will use the app.

Who it is for

people who want every tracking feature and will pay for it

Price

$329.99 regular price at Oral-B US ($279.99 on sale as of November 2026).

$279.99 $329.99 Save $50.00
Quoted from the vendor pricing page on November 12, 2026.

Key features

• 3D Teeth Tracking with position detection in the Oral-B app
• Interactive color display with real-time coaching
• 7 Smart Cleaning Modes, including Gum Care and Tongue Clean
• Smart Adapt mode adapts up to 10 times per second
• Smart visible pressure sensor and 2-minute timer with quadrant pacing

Strengths and weaknesses

• Strength: Most complete feature set on this list
• Strength: Box includes 4 iO Ultimate Clean heads and a Power2Go charging travel case
• Strength: 30-day money-back guarantee from Oral-B
• Weakness: $329.99 regular price is more than six times the Sonicare 4100
• Weakness: Most extra features depend on using the Oral-B app
• Weakness: iO brush heads only

Key facts

• Price: $329.99 regular, $279.99 sale
• Modes: 7
• Tracking: 3D Teeth Tracking with position detection
• In the box: 4 iO heads, Power2Go charging travel case, magnetic charger
• Weight: 4.4 oz with brush head

Where it ranks

Oral-B iO Series 9 is No. 8 in our Best Electric Toothbrushes verdict.