Oral-B iO9 Electric Toothbrush - Black Onyx - Series 9

Replace the brush head every three months, or sooner if the bristles are frayed.

The Smart Pressure Sensor will illuminate red if you are brushing too hard. It will turn green when you are applying the correct amount of pressure.

No, the iO9 uses iO series brush heads, which are designed specifically for this model.

You can select the brushing mode on the interactive display of the toothbrush. You can also customize the modes in the Oral-B app.

Yes, the toothbrush handle is waterproof and can be rinsed under running water.

The Oral-B iO9 typically comes with a two-year limited warranty.

A full charge typically lasts up to two weeks with regular use.

Ensure the toothbrush is fully charged. If it still doesn't turn on, try resetting it by holding the power button for 10 seconds.

Ensure Bluetooth is enabled on your smartphone and that the toothbrush is within range. Try restarting both the app and the toothbrush.

Make sure you are using an iO series brush head and align it correctly before attaching it to the handle.

Make sure you are charging the toothbrush fully and avoid leaving it on the charger for extended periods. Check that the charging base is clean and making good contact with the brush.