Metal Mouth Message Board

So I've had the cement blocks removed, the first time it was easy because they were blue. Then they put other ones with white colors(why?) and they haven't fully removed it yet. They're gonna do it when I go in next week, but I'm kinda worried can it damage the enemal? It's painful when they start shaving it down. Also I had fillings on those same molars, so it must be difficult to know how much they gotta remove exactly? They should have done it months ago too because my molars don't fit like they used to because of this.