Achtung !
Philips, Sonicare optimal white brush, removes up to 2X more discolouration, RFID chip, white - 45% off - $31.43 for 6 @ amazon.com.au via amazon Germany
Stock up if you have sonicare products. These are not on sale often. 45% off is good.
Tried non genuine el cheapos and they are crap.
I hate this sonicare head
such small brushing surface and the back of the brush doesn't have the soft plastic coating, if it touches your teeth? it'll sound like you're breaking concrete