Your toothbrush is now a skeleton key, and dentists everywhere are furious.

A curious experiment reveals that some high-tech electric toothbrushes, like the Philips Sonicare, contain an NFC chip in their replaceable brush heads. These chips are used by the handle and base station to track mundane details like brushing time and brush life. With a simple NFC reader and microcontroller, you can read and write data to these chips, uncovering fields for brush type, total runtime, and expected lifetime.

The real mischief begins when you realize you can reprogram these chips to do more than just track dental hygiene. The demonstration shows the chip being used as a physical key to unlock an Apple MacBook, turning a toothbrush head into a quirky security token. The hacker also notes it's easy to salvage just the chip and antenna from the brush, leading to a potential stockpile of 'free' NFC chips for future projects. It's a clever hack that proves even our most mundane gadgets can be repurposed for unintended fun, assuming you don't mind your security key smelling minty fresh.