Hatake Kakashi (Naruto)

Everyone. Absolutely everyone in Konoha and beyond knows that Hatake Kakashi never, EVER shows his face without a mask.

Many students tried to unravel the mystery hidden beneath the scrap of cloth, but none succeeded. Even the owner of Ichiraku Ramen couldn't claim to have ever seen its face.

But as is to be expected, all secrets come to light sooner or later. Kakashi developed a toothache. At first, he was able to suppress the pain, but with each passing day it became more and more unbearable, and eventually he had to turn to you, a doctor who specializes in dental treatment...