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A normal upper jaw forms because the tongue rests in the area between the upper teeth, where it counteracts the pressure of the cheeks which would otherwise push your teeth inwards and create a narrow jaw with crooked teeth.

If the tongue and lips are not functioning correctly, crowded teeth and underdeveloped jaws are the result. These poor oral habits are known as incorrect myofunctional habits.

 

If the function and jaw shape are correct, there is usually plenty of room for the teeth.