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

Being overweight may also contribute to bacterial infection of the gums that can lead to tooth loss.  In a study at Case Western Reserve University , obese adults between he ages of 18-34 were 76% more likely to have periodontal disease than similar aged people at a healthy weight.  And adults under 35 with large waistlines, at least 34 inches for women and 40 inches from men, were about twice as likely to have gum disease as their slimmer counterparts.  While the study does not prove that obesity causes gum disease, it points out that excess fat secretes substances called cytokines that can damage tissues around the teeth.  Also heavy consumption of sugary foods may allow bacteria to thrive in the mouth, while fiber rich fruits and vegetable may inhibit plaque.