they basically suck,and it gets worse after the orthodontist decides that because one molar is one millimeter too far back they need to stay on for six more months. Oh, and every time i go there it takes at least an hour for the orhto guy to get around to looking at my mouth and saying, well, tie in the 4 and the 6, and keep everything else the same. I've wasted a good 12 hours of my life staring at the ceiling in that place