Scientists at Princeton and Tufts are working on a superthin tooth sensor (a kind of temporary tattoo) that sends an alert when it detects bacteria associated with plaque buildup, cavities or infection. It also notifies your dentist, adding an extra layer of social pressure to make an appointment. The sensor may have wide-ranging use: the researchers have already used it to identify bacteria in saliva associated with stomach ulcers and cancers. While the sensor won’t last long on the surface of a well-brushed and flossed tooth, Michael McAlpine, the project’s leader, says that the sensors will be inexpensive enough that you can replace them daily.
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