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The appliances and therapy to be discussed are the lingual and labial arches. They have been used successfully by Dr.; CIershon and me for more than twenty-five years. This period of time has given ample opportunity to observe results long after the removal of appliances. We are able to treat successfully with the lingual arch and its various attachments about, 85 per cent of all orthodontic conditions. With the exception of open-bites, all other cases can be treated with a combination of the lingual and labial arches.

Orthodontic treatment today reflects two schools of thought: In one, zrppliances are used at intervals throughout the patient’s growth period proqlucing changes as the child grows and develops, wit, h frequent periods during which appliances are removed in order to allow natural adaptation of the tis-: sues to the new positions of the teeth, and reaching complet, ion at the time the patient reaches …