I use my teeth for everything: to open stuff, to tear hanging thread off clothing, to hold something while I am doing other things with my hands, to open bottles... They're a great tool. If savta catches me, she squints her eyes and gives me a little smack.
Once, when my brother and I were in our early years of grade school, I learned exactly why you shouldn't ever use your teeth. Mom, please forgive me for telling this story.