The young cast of Stranger Things stole the hearts of viewers last summer when the show aired on Netflix. The cast is having the time of their lives riding out the success at award shows where they are being crowned winners. However, one star of the show has a surprising condition that was written into the script. Gaten Matarazzo became a fan favorite thanks to his charming and gregarious character Dustin. In the show, Dustin has an unusual genetic disorder where his teeth won't fully grow in.