the upper and lower teeth can often be narrow or constricted. This can cause teeth to become crowded and is not as pleasing as a broad smile. An upper and lower expander in children or braces in adults can be used to correct this problem.
 
The pendulum appliance can be used to move the upper molars backward in an effort to correct the bite and make room for the front teeth.
 
Quad helix expanders increase the width of the palate without the use of a traditional screw-based expander. Quad helix expanders work best in cases where minimal expansion is needed.

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