Why is Lip-stretching good for the teeth alignment?
Persons with bad teeth alignment have their tips of the tongues either placed behind the bottom front teeth or between the top and bottom rows of teeth. Both cases will affect the teeth alignment adversely. The tip of the tongue will fit nicely on the roof of the mouth behind the front teeth if the force to close lips becomes stronger. This will not destroy the teeth alignment. That is the reason why we often see elderly women with weak strength to close her lips having buckteeth.