I went to Dr. Lozman for my braces. Unlike many others' orthodontists, he did not put a bar behind my bottom teeth. I used the retainer as instructed, but five years later, my bottom teeth have shifted very much. This has not happened to my friends who had a bar inserted, leaving me to wonder why I was never given the option. His response is that teeth change and I can pay to have a new retainer made. Not exactly what you want to hear after paying a fortune for braces. It is just unfortunate when you are the one whose teeth change because your orthodontist didn't do what seems to be the normal practice in the community.