If your toothbrush does not connect with the Philips Sonicare app, follow the steps below:

1. Make sure that your toothbrush is fully charged.
2. Check that your phone's operating system and the app are updated.
3. Activate Bluetooth on your mobile device.
4. Hold your toothbrush and mobile device close together.
5. Remove your toothbrush from the charger or push the mode button to activate the LED symbols on the handle.
6. Open the Sonicare app.

If your toothbrush does not connect when you open the app, unpair/forget your toothbrush in your phone's Bluetooth settings. Restart the Sonicare app to re-pair your device. Clearing the Bluetooth cache on your mobile device may also resolve connectivity issues.

Note: users of the Sonicare 9900 Prestige toothbrush may also be able to resolve connection issues by resetting the handle.