tongue

mouth

Eye

I agree with tonque

Now that the answer is given, I put eye because an opthamologist told me that once about the cornea when I had an abrasion. So I looked up the answer just now. The answer is a bit more complex….

Mouth wounds heal faster than injuries to other parts of the skin, and now scientists are learning how the mouth performs its speedy repairs.

Eye tissue, specifically the cornea is the fastest healing tissue in the human body, thus, most corneal abrasions will heal within 24-36 hours.

And Muscles and tendons generally heal the fastest. These parts of the body recover more quickly thanks to an ample blood supply.

The human body is fascinating!

Really! ha ha I sold a 1981 Truck because it had NO cup holders.