Open Question: Braces braces braces? And there wires?

Ok so I have braces. Well in braces you have the band that goes in the back to hold the wires......(glued on the tooth).........before that tooth I have a baby tooth. So what my orthodontics did was put a wire there and on top of the wire there is a green tube wrapping around it. I was wondering.........Is is ok to bite on it a little? Whenever I bite down it bends just a bit. Has anywon