Answer:
What dentists battle on a daily basis
I'm a small ring shaped fried cake, often with bavarian cream or fruit filling, and sometimes covered in icing and sprinkles.
What word of five letters has only one left when two letters are removed?
Some keep it in a dumpster while others keep it in their trunk.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
My days are numbered. What am I?