Orthodontic fixed appliances are also known as what?

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Orthodontic fixed appliances are also known as braces.
A separator is a device placed to force or wedge the teeth apart long enough for initial tooth movement to occur.
The Hawley retainer is the most commonly used removable retainer.It is worn to retain the teeth passively in their new position after the removal of the fixed appliances.
Clear "aligners" are a new way to straighten teeth without fixed appliances.The customized aligners are fabricated and worn at 2-week intervals.The patient's teeth gradually move from the pressure that the aligner creates until the desired result is achieved.

Orthodontic Fixed Appliances Are Also Known as What