I have this dark spot in between my two front, bottom teeth. It looks like there is just something stuck in between them, but I have brushed my teeth at least twice a day, flossed, mouthwash, tried using a toothpick, and I can't get rid of it.

It has been there for about a week or two, hasn't gotten any worse. It just appeared one day. I won't be able to see my dentist until next month, but I'm wondering if anyone here might know what this is or if it is something to be concerned about and needing to be looked at right away.