Answer:
I may be made of metal bone or wood and have many teeth. My bite hurts no one and the ladies love me.
I am a nut with a hole
They are many and one, they wave and they drum, used to cover a stare, they go with you everywhere.
What is easy to spot but hard to find?
Flat as a leaf, round as a ring; have two eyes, can't see a thing. What am I?
No matter how little or how much you use me, you change me every month.