I have a horrible habit of
biting my
nails, and I ended up having tiny pieces of nail circulating in my mouth. At the same time, I started getting a pain between two of my teeth. Therefore, I thought I'd gotten a piece of nail stuck, and attempted to remove it with floss and even thin cotton. After no show from a piece of nail, I started to see blood on the floss and cotton, and stopped, fearing further injury. The only other possibility was that I'd cut myself between my teeth slightly.