One unforgettable bluetooth device!
I don't know the Phillips Sonicare product, but there's at least one thing that could potentially explain the lacking (i) indicator: If you have installed a specific Phillips app for use with the product, it could have offered to pair with the device directly from within the app. In that case you can use that specific app to unpair the device again - or you might have to resort to deleting the app if that is possible for you.