A tiny tooth sensor can detect whether a person is deviating from a diet or stuck on a smoking habit. The capability to monitor mouth motions may help physicians keep track of a patient’s progress or allow a patient to better understand his or her health habits. The sensor’s accelerometer, in combination with machine learning software, will detect and distinguish between chewing, smoking, coughing, or speaking, according to New Scientist. The device’s inventors at National Taiwan University in Taipei glued prototypes onto eight people’s dentures to show the system could accurately recognize what the wearer is doing almost 94 percent of the time. Working prototypes of the tooth sensor used wires to connect to a power source and a data-logging device—an awkward arrangement for human testers.