my tooth is extremely white and HURTS like crazy.?!

so my tooth that has a filling on it half of it is normal and the other half is like paper white and sticking out, it also has some sort of dot on it i couldnt tell if it was red or black and its really loose, but only the white part is.....I was eating a bacon cheeseburger and the bacon was super hard and i bit on the tooth and ever since then it gave me pain. This happened like 6 hours ago. Its not really a strong pain, its just when i eat its super painful, and when i bite down. ehhhhh anyone have and idea as to what's wrong?