Well, if the metal is removed and left out of the piercings, the hole will grow back together. I do not know about the stretched ear lobes. And I had not seen the brow built up like that.
It IS shocking when your child comes home with that sort of thing. Sometimes it is done for the shock effect. And sometimes it is done so the parents actually pay attention to the child. (I speak from experience.)
So hold your children, listen to them, take time with them as they grow. And if you are a grandparent, do what you can to let those precious grandchildren know you love them. It will help. (It doesn't preclude ALL rebellion, sad to say.)