A smile is something that mirror will always reflect, if u r good & honest in life. A smile is a facial expression formed by flexing the muscles near both ends of the mouth and by flexing muscles throughout the mouth.  Smiling is something that is understood by everyone despite culture, race, or religion; it is internationally known. Cross-cultural studies have shown that smiling is a means of communication throughout the world.

But there are large differences between different cultures. A smile can also be spontaneous orartificial.