Separators or spacers may be placed between your teeth before your banding appointment.  These small elastics or wires fit snugly between the teeth to help move the teeth slightly apart so the bands can be fitted about a week later.  They may be uncomfortable.  Tylenol or Advil can help relieve the soreness. A spacer can fall out on its own if it has made enough space.  If you have definitely seen the spacer fall out,  find out if it has done its job by slipping some dental floss between the two teeth.  IF the floss gets stuck the spacer had not made enough space and you will need to call the office.  If you did not see it come out, call the office (very rarely a spacer will go down under the gumline).  If you have any questions call.