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Basically a habit under 4 yrs; can extend to 12 yrs. Only causes damage (‘buck teeth’) from time of onset of permanent teeth (6–7) but usually settles by then. Usually spontaneous cessation if not an issue between child and parent.
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Can prevent by use of dummy (pacifier)
No special diet or medication
Avoid drawing attention to it
Give child extra attention
Help child explore other solutions/distractions
Refer if prolonged and excessive