It follows therefore that the tongue of a mouth breather will tend to rest on the floor of the mouth or suspended midway. Since the top jaw is not then shaped by the normal pressures of the tongue, the end result is the development of a narrow V-shaped top jaw. Aesthetically, this contributes to a narrowing of the facial structure, crooked teeth, and orthodontic problems. It has been well documented that mouth-breathing children grow longer faces.
