http://www.braces.org/studentsteachers/emergencies/
American Association of Orthodontists
Many common orthodontic “emergencies” can be handled easily at home. To help you accurately describe an emergency situation to the orthodontist, use the diagram at the end of this section, which illustrates and names each part of a typical set of braces. A list of supplies to keep on hand is also posted at the bottom of the section.