You can actually get a smartwatch that vibrates when you touch your face

A company in Seattle has designed a smart tracker that vibrates to alert you every time you touch your mouth, nose or eyes.

Immutouch is a device that fastens around your wrist like a regular smartwatch or fitness tracker. The only difference is that, instead of counting your steps or monitoring your heart rate, this wearable will count how many times you touch your face in a day.

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https://www.trustedreviews.com/news/immutouch-smartwatch-vibrates-when-you-touch-your-face-4018228