Answer:
I shrink smaller every time I take a bath.
kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all.
I have a straight back and sharp teeth to cut objects.
I am an English word with 3 consecutive double letters.
What is easy to get into, but hard to get out of?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.