The Button On My Oral-B iO is Glowing Yellow. How Do I Fix It?

You purchased your Oral-B iO a few months ago and now, even though it appears to be functioning normally, the center of the Mode button has started glowing yellow. According to Oral-B, it may appear as a yellow, orange, or amber light.

Here’s what this means and how to address it:

One of the benefits of owning an iO is the feedback it provides. It includes quadrant alerts to signal when to move to the next section while brushing, a two-minute brushing timer, and a pressure sensor that indicates red when you apply too much pressure and green when it’s just right.

Your brush will also indicate when the battery is low, which is signified by the power button glowing red.

But what does it indicate when the mode button, the second button under the power key, lights up in yellow? Here’s how it appears on the Oral-B iO Series 4:

The yellow light is a form of feedback from your iO, indicating that it’s time to replace your toothbrush head after approximately three months of use.

Older brush heads lose their effectiveness over time, leading to less efficient cleaning. You can also tell it’s time for a replacement if the bristles have splayed or if the bristle color has faded.

After replacing the brush head, you’ll need to reset the brush reminder by pressing and holding the mode button for two seconds. The brush will vibrate to confirm.

To set up a new brush reminder, access the Oral-B app, select “Devices” from the bottom menu, and sync your iO with the app to input the new brush head information. The app will prompt you to specify when you started using the new brush head and its type, ensuring you receive another reminder in three months.

For our top recommendations on Oral-B brushes, check out our comprehensive review of the best Oral-B brushes.