Answer:
You use me between your head and your toes the more I work the thinner I grow.
I cannot be felt seen or touched. Yet I can be found in everybody. My existence is always in debate. Yet I have my own style of music.
What has a neck but no head?
What has many teeth but can't bite?
I walk on 4 legs in the morning 2 legs at noon and 3 legs at night.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.