A Smile is the sweetest and yet the most inexpensive thing one can give. It costs not a single cent to smile, but bit give immense pleasure to the one who receives it. It requires so little effort to smile yet it is our most valuable asset. A smile is quite contagious. When we smile, everyone smiles with us. It can change a person’s outlook of life. It can improve one’s personality. The sight of a sweet smile can brush away one’s troubles.