It has the function of communicating feelings and pmitting information.

Smiling can eliminate the sense of strangeness between people and create a sense of security, intimacy and pleasure.

For the first time, a smile is a greeting; on a festival, a smile is a song of congratulation; a misunderstanding in communication; a smile is an apology; a farewell friend, a smile is a farewell speech.

A smile is a process of mutual mingling and mutual infection. It can create harmony, harmony, mutual respect and mutual love, and it can relieve people's physical and psychological pressure.

Smile can win the best seats and bring the greatest economic benefits.

Many famous entrepreneurs in the world are deeply aware of this, so they give a very high evaluation of their smiles, and even serve them as a magic weapon for business management and the success of enterprises.

The president of a travel agency in the United States warns heartily.

Airline stewardess:

"Smile, Smile, Smile are equal to success".

The Oriental Hotel in Bangkok, Thailand, has won several times the laurel of the world's top ten hotels. One of the secrets of its success lies in the inclusion of "smiling face" in the specification of guests.

In interpersonal relationships, it is necessary to show respect, friendship and smile.

Smiling is a healthy and civilized manner. A sweet smiling face is always loved.

It means the lips are opened gently, exposing the teeth, smiling deeper and smiling in the eyes.

Use a light smile when expressing warm welcome, pleasant conversation, and happy meeting with someone.

When you laugh, your eyes get smaller and your mouth open.

People tend to appreciate men's hearty laughter while women use their hands to cover their mouths when they laugh.