The "fastest healing" part of your body is debatable, but may well be the inside of your mouth. In the normal act of eating lunch, you scrape thousands of cells away from the inside of your cheeks. By suppertime, almost all of those cells have been replaced.
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The fastest healing body part is the cornea of the eye. The cornea can heal anywhere from 24 to 36 hours.
Your tongue is the fastest healing part of your body. Your eye also heals at a fast rate compared to other parts of your body.