I noticed my new sonic screwdriver^H^H^H^H^H toothbrush had RFID so of course I had to see what was in it. I found where it keeps the settings and the time counter and maybe a few other things. Blogged here: Hack All The Teeth! – Volcano.Newts.Org
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Of course tooth brushes needed NFC! 
Oral B makes a Bluetooth tooth brush that is compatible with HomeAssistant.
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