There's a black line I see between my tooth and my gum. I've thought it's a vein but I took a closer look and there's black stuff on it my tooth, it's thick, not on my gums. it feels hard and when I use my dental floss, it feels like a hill, rough. It doesn't hurt at all, my gum there between my teeths is light red and the gum hurts a little if I press hard, the black thick stuff on my tooth doesn't hurt, just feel rough. I dunno if it's black tartar or decay. Anybody would like to explain this to me?
