How people take care of their mouths is often a reflection about how they feel about themselves.  At  birth the only fully developed organ is the tongue.  It is needed for sucking.  For the first two months of life our mouth is our primary organ.  We use for survival,  expressing ourselves and to explore our new world.  consequently it
is very significant in our unconscious.  Because of this it is my opinion that how we take care of our mouths is a reflection of how we feel about ourselves.  People who feel good about themselves take good care of their mouth and people who have a poor self image generally do not take good care of their mouth.  Marvin Mansky