DYSON'S CAMERAJET TOOTHBRUSH USES A 100K PIXEL CAMERA TO AUTO-TARGET AND JET-FLOSS GAPS BETWEEN TEETH

Summary from the TLDR Hardware newsletter

Dyson's CameraJet packs a 100,000-pixel macro lens camera into the brush head, running its "Gap Optical Targeting" machine learning system to detect and predict gaps between teeth in real time, triggering a jet of water within 100 milliseconds of spotting one.