It’s very simple: tap the toothbrush icon on the top left of the main screen for Apple devices, or on the bottom left of main the screen for Android devices (coming soon), or go to settings, then select “My toothbrush.”
Once the toothbrush page is displayed, select “Forget my toothbrush” at the bottom of the screen.
Once your toothbrush has been forgotten, you can pair it with another device.