The time zones known as Greenwich Mean Time and the International Date Line are sometimes alternatively used to demark the western from eastern hemispheres, but the would not be true hemispheres as those time zones are not straight longitudes.
The final part of braces are interarch rubber bands, which are used to adjust bite and jaw position. These are connected to the brackets with hooks, often connecting the top tooth bracket with the bottom tooth bracket to help adjust the position of the teeth in the mouth and the position of the jaw.
Why do orthodontists use rubber bands with braces? Rubber bands are an important part of the orthodontic treatment; they provide the connective force necessary to move the teeth and jaw into the proper alignment. First, there are the brackets, which are the square metal pieces bonded directly to the teeth.