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.
More in Dental Care. Bands are used in orthodontics to anchor an appliance to the teeth or secure an archwire to the molars. Used on the molars and in some cases the premolars, bands are made from stainless steel and are very similar to a ring. Bands come in different sizes and are custom fit to the tooth using the appropriate dental instruments.