Answer:
What gets whiter the dirtier it gets?
I am owned by every man, though my length differs. Their wives use me after getting married. What am I?
I am a piece of paper that takes most people 3 or 4 years to get. What am I?
Use me if you really want to see inside someone
I am easy to waste. I am unstoppable. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.