My toothbrush streams gyroscope data
Gyro/accelerometer measurements alone can't tell you how well you cleaned your teeth, only how you moved the toothbrush. A simpler and more effective solution is plaque-staining dye:<p><a href="https://en.wikipedia.org/wiki/Disclosing_tablets" rel="nofollow">https://en.wikipedia.org/wiki/Disclosing_tablets</a>