It is probably a cavity, but it could be that you just hit it really hard on something. My brother's tooth turned gray because he ran into a pole. :)
After 2 weeks they turn gray.
check October readers digest magazine for the rigth answer.
Days Turn Blue to Gray was created in 2004.
Products won't do it only permanent hair dye will.
How can i chang my purple to light gray
Lack of oxygen
I just found a hair in my hairbrush that was brown from the root to 4cm down the shaft, then turned white. So it can turn back to its natural colour.
Yes, they may turn grey as you get older.
You're hair starts to turn gray as you grow older.
Yes
yes
It would turn gray if it was sick.