Openbite is an insufficient vertical overlap of the teeth. It is caused by oral habits such as tongue thrust, digit sucking, or when the jaws don't grow evenly. Timing of treatment is critical to the overall success of the therapy.
This is what an openbite looks like:
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How can an openbite be orthodonticaly corrected?
Openbite can be corrected through growth modifcation of the jaws using braces; extrusion of the front and anterior teeth; and in some cases surgical correction of the jaws. Also, breaking oral habits such as digit sucking, will facilitate the correction of an openbite.