This morning when I woke up, I was surprised to find that during the night my teeth (every single tooth!) had become black at the gumline and also around the cracks inbetween my teeth. I promptly brushed and flossed me teeth, and thought the situation over.
Two hours later I looked in the mirror again to find the process was starting over again. I could see a little bit forming on some of my teeth. I haven't eaten anything since dinner last night (i felt a little sick to my stomach before I went to bed), and I brush my teeth at least two times a day, every day.
What could possibly be causing this? It's really starting to scare me.