Woman smiling at a non-mahram man
Question

                What is the ruling on a woman who smiles in front of a non-mahram man, but without showing her teeth or making any sound?.
Praise be to Allah.It is haraam for a woman to uncover her face 
    or to smile at a non-mahram man, because of the evil to which that may lead. 
And Allaah is the Source of strength.