Do you remember the movie called Teeth? A girl had a fully grown teeth in her vagina, a teeth that could protect her from male violence. Not a bad idea, actually, however there is a possibility that some women might grow such teeth if they suffer from teratoma, a benign tumor that is composed of stem cells, cells that can become anything the body tells them to become.
Some women had teeth grown on their ovaries, a 4 year old child had a teeth in his brain, another woman had a teeth grown near her left eye and a guy had teeth and eyes grown in his lungs due to teratoma. DNews explains.