Correct oral posture Most children start out with attractive faces, but if they leave their mouths open, their faces will grow vertically and they are likely to develop into unattractive teenagers with long faces, flat cheeks, prominent noses, and protruding front teeth. Alternatively they may have the common habit of resting the tongue between the teeth and sucking against them when swallowing. This will cause the teeth to tilt inwards and crowd, making the middle of the face look concave.
Many types of treatment will straighten teeth, but most tend to pull them back, necessitating extractions and further reducing room for the tongue. Orthotropists believe that this is detrimental to facial development and that ideal facial growth, together with permanent straightening of all the teeth, can only be achieved if room is provided for the tongue and the patient is taught to keep his/her mouth closed and swallow correctly.