A short upper lip may be defined as an inability to close the lips without strain. There is no normal lip seal. Short upper lips may lead to protrusion of the teeth by reducing the restraining pressure acting on the teeth from the outside
Myofunctional Therapy for a short upper lip (the distance between the nose and the pink part of the lip) is achieving a lips closed position.
It is important that the lips fit together to guide the teeth and support them for a lifetime.