Hello i was wondering if you guys can help me. I'm desperate right now. I need to know why my teeth has black stains over a period of time. Even when the dentist removes it, they come back with after 2-3 weeks. Dentist aren't giving me a solution. I need help also with my lip this happened in January. I have this black dot on my lip which was suppose to be removed with stitches, but after a week it expanded into an distorted oval shape dot instead.