Metal Mouth Message Board

My son has braces and an expander. He came to me on Friday and said the band on his back molar was loose. At that point it wasn't moving a whole lot. Now it's REALLY moving. I am going to call in the morning...my question is has this happened to anyone? AND, will they have to undo everything to get it cemented back into place. His expander is attached to this band as well as the top wire.

Gardnr