Now, tooth sensor that rats you out if you lie to doc

Scientists have developed a sensor that when embedded in a tooth could tell doctors if patients have ignored medical advice to give up smoking or eat less.
The sensor works by maintaining a record of how people use their teeth. Built into a tiny circuit board that fits in a tooth cavity, it includes an accelerometer that sends data on mouth motion to a smartphone.
Machine learning software is taught to recognise each telltale jaw motion pattern. Then it works out how much of the time someone is chewing, drinking, speaking, coughing or smoking, 'New Scientist' reported.
The device, developed by Hao-hua Chu and colleagues at National Taiwan University in Taipei, can be fitted into dentures or a dental brace, and the team plan to miniaturise the device to fit in a cavity or crown.

In tests on eight people with a prototype implant, the sensor showed "great promise", researchers said.