C.M.
this happened to me when I was a kid although it was my adult tooth. My front tooth died. My parents never did anything for it, and all through out growing up I was made fun of for having a "brown" tooth. Finally at 30 years old I went and had a crown put on it. My tooth never had a root canal or anything. I was told from the dentist that my tooth in some weird way cleaned itself out and then calcified. I am SO much happier now that that tooth now matches the color of the rest of my teeth! I would call the dentist in the morning. Don't let it go