Answer:
I am expelled from you orally with a sound
I start new then become old. Start clean but become dirty. I usually start big then become little. What am I?
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
I twist and turn and leaves a loop
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?