forum threadSUCHaDEAL posted Dec 11, 2025 04:47 PM
forum threadSUCHaDEAL posted Dec 11, 2025 04:47 PM
Live Sunday 12/14 Oral-B iO Series 4 Gum & Sensitive Care rechargeable toothbrush $79.99 get $30 Extra Bucks, can pay w/extra bucks Free Shipping
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The main difference is that the iO4 has Bluetooth to connect to the Oral-B app, whereas the iO2 and iO3 do not. If you don't care about tracking your brushing habits on your phone, the iO3 is nearly mechanically identical to the iO4.
Here is the breakdown of the specific upgrades you get with the iO4 compared to the "earlier" (lower numbered) models.
1. Bluetooth & App Connectivity (iO4 Only)
The most significant difference is that the iO4 connects to the Oral-B app. This allows it to track your brushing history and give you a "brushing score".
iO4: Has Bluetooth. Tracks brushing time and habits in the app.
iO3 & iO2: No Bluetooth. They function as standalone toothbrushes.
2. Cleaning Modes
The iO4 offers more versatility, specifically for sensitive teeth.
Feature iO Series 4 iO Series 3 iO Series 2
Total Modes 4 Modes 3 Modes 3 Modes
Specific Modes Daily Clean
Whitening
Sensitive
Super Sensitive Daily Clean
Whitening
Sensitive Daily Clean
Sensitive
Super Sensitive
Key Difference: The iO4 is the only one of the three to include both "Whitening" and "Super Sensitive" modes. The iO3 lacks "Super Sensitive," and the iO2 lacks "Whitening."
3. The "Smart" Pressure Sensor (Important Upgrade)
The iO4 and iO3 share the same advanced pressure sensor ring, but the iO2 has a downgraded version.
iO4 & iO3: Have the full Smart Ring 360° light. It glows Green when you apply the perfect amount of pressure, Red if too hard, and White/Blue if too soft. This "Green light" feedback is a core feature of the iO technology.
iO2: Has a simplified sensor. It glows Red to warn you if you press too hard, but it typically lacks the Green light guidance to tell you when you are brushing correctly.
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