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 the kind of an ant that's good at math. What am I?
I have branches but no fruit trunk or leaves. What am I?
I run up and down the stairs without moving. What am I?
Squeeze me and I cry tears as red as my flesh, but my heart is made of stone. What am I?
No matter how little or how much you use me, you change me every month.