Today we had an enjoyable enerichment with big field

I learned that hermione is hard to wrap with toilet roll and

William Day takes erections into account when measuring himself.

He had a big red smile on his face and enjoyed his white covering

Smile

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For other uses, see Smile (disambiguation).

This article possibly contains original research. Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research may be removed. (December 2012)

A Nepali Newar woman smiling

A smile is a facial expression formed by flexing the muscles near both ends of the mouth and by flexing muscles throughout the mouth.^[1] Some smiles include contraction of the muscles at the corner of the eyes (see 'Duchenne Smiling' below). Among humans, it is an expression denoting pleasure, sociability, happiness, or amusement. This is not to be confused with a similar but usually involuntary expression of anxiety known as a grimace. Smiling is something that is understood by everyone, regardless of culture, race, or religion; it is internationally known. Cross-cultural studies have shown that smiling is a means of communication throughout the world.^[2] But there are large differences between different cultures. A smile can also be spontaneous or artificial.

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Historical background[edit]

Many biologists think the smile originated as a sign of fear. Primalogist Signe Preuschoft traces the smile back over 30 million years of evolution to a "fear grin" stemming from monkeys and apes who often used barely clenched teeth to portray to predators that they were harmless. The smile may have evolved differently among species and especially among humans.
Biology is not the only academic discipline that interprets the smile. Those who study kinesics view the smile as an affect display. It can communicate feelings such as: love, happiness, pride, contempt, and embarrassment. More info: The Psychology of Human Smile, The Smile

Social smiling normally develops between 6 and 8 weeks of age.

Social behavior[edit]

This section's tone or style may not reflect the encyclopedic tone used on Wikipedia. See Wikipedia's guide to writing better articles for suggestions. (October 2012)

“Service with a Smile”—This has always been at the core of American businesses since the beginning of the 1900s. Research continually proves that this is true; smiling really does increase attractiveness and likability between humans. In fact, smiling correlates with greater trust, greater financial earnings, and increased interpersonal cooperation.^[3] In a time of increased stress due to cutbacks, high debt, and increasing family issues, employees are often required to work with a distressed public. However, a smile tends to convey respect, patience, empathy, hospitality and compassion. For example, when an employee smiles at a stressed customer, and exhibits excellent listening skills, most of the time, there is a report of total satisfaction.^[4] Research also reports that people receive more help when they smile. Even the smile of a stranger produces more “Good Samaritan” effects on the receiver.^[5] When you smile, even memory retrieval of your name is enhanced as is shown in neuroscience research.^[6]

A Bangladeshi woman smiling

Laughter[edit]

In social contexts, smiling is related to laughter. In this situation, two kinds of smiling are analyzed:

Smiling is not a pre-laughing device and is a common pattern for paving the way to laughter;
Smiling can be used as a response to laughter in the previous turn.^[7] Smiling and laughter have different functions in the order of sequence in social situations.

Sex appeal[edit]

Smiling is a signaling system that evolved from a need to communicate information of many different forms. One of these is advertisement of sexual interest. Female smiles are appealing to males, increasing physical attractiveness and enhancing sex appeal. However, recent research indicates a man's smile may or may not be most effective in attracting women, and that facial expressions such as pride or even shame might be more effective.^[8]

Cultural differences[edit]

While smiling is perceived as a positive emotion most of the time, there are many cultures that perceive smiling as a negative expression and consider it unwelcoming. Too much smiling can be viewed as a sign of shallowness or dishonesty.^[9] Japanese people may smile when they are confused or angry. In other parts of Asia, people may smile when they are embarrassed. Some people may smile at others to indicate a friendly greeting. A smile may be reserved for close friends and family members. Many people in the former Soviet Union area consider smiling at strangers in public to be unusual and even suspicious behavior. Yet many Americans smile freely at strangers in public places (although this is less common in big cities). Some Russians believe that Americans smile in the wrong places; some Americans believe that Russians don't smile enough. In Southeast Asian and Indian cultures, a smile is frequently used to cover emotional pain or embarrassment.^[10]

Dimples[edit]

An American man smiling, with dimples

Cheek dimples are visible indentations of the epidermis, caused by underlying flesh, which form on some people's cheeks, especially when they smile. Dimples are genetically inherited and are a dominant trait. A rarer form is the single dimple, which occurs on one side of the face only. Anatomically, dimples may be caused by variations in the structure of the facial muscle known as zygomaticus major. Specifically, the presence of a double or bifid zygomaticus major muscle may explain the formation of cheek dimples.^[11] This bifid variation of the muscle originates as a single structure from the zygomatic bone. As it travels anteriorly, it then divides with a superior bundle that inserts in the typical position above the corner of the mouth. An inferior bundle inserts below the corner of the mouth.

Real and fake smiles[edit]

A smile does indeed have great power and great social rewards. However, there is a difference between an authentic smile and a counterfeit smile. A smile is an outward sign of perceived self-confidence and internal satisfaction. It seems to have a favorable influence upon others and makes one likable and more approachable.^[12]

Duchenne smiling[edit]

A Duchenne smile engages the muscles around the mouth and eyes.

Although many different types of smiles have been identified and studied, researchers (e.g. Freitas-Magalhães) have devoted particular attention to an anatomical distinction first recognized by French physician Guillaume Duchenne. While conducting research on the physiology of facial expressions in the mid-19th century, Duchenne identified two distinct types of smiles. A Duchenne smile involves contraction of both the zygomatic major muscle (which raises the corners of the mouth) and the orbicularis oculi muscle (which raises the cheeks and forms crow's feet around the eyes). A non-Duchenne smile involves only the zygomatic major muscle.^[13] “Research with adults initially indicated that joy was indexed by generic smiling, any smiling involving the raising of the lip corners by the zygomatic major…. More recent research suggests that smiling in which the muscle around the eye contracts, raising the cheeks high (Duchenne smiling), is uniquely associated with positive emotion.”^[14]

Pan-Am smile[edit]

The Pan-Am smile, also known as the "Botox smile", is the name given to a "fake smile", in which only the zygomatic major muscle is voluntarily contracted to show politeness. It is named after the airline Pan American World Airways, whose flight attendants would always flash every jet-setter the same perfunctory smile.^[15]

Hidden emotions within smiling[edit]

Happiness is most often the motivating cause of a smile. However, this is not always the case. Smiling can also be interpreted as discomfort as a result of nervousness, embarrassment and even frustration.^[16] In one study, created to investigate the correspondence between perceived meanings of smiles and their morphological and dynamic characteristics, it was found that “perceived embarrassed/nervous smiles had greater amplitude, longer duration… related to those perceived as polite.”^[17]^[18] Work by John Gottman has shown that smiling and other such expressions of positive emotions are important to shaping relationships with others; researchers could predict the quality of marriages many years into the future based on the number of such interactions (see also agreeableness).^[19] The study of smiles is a part of gelotology, psychology, and linguistics, comprising various theories of affect, humor, and laughter.^[20]

Smiling in animals[edit]

In animals, the exposure of teeth, which may bear a resemblance to a smile and imply happiness, often conveys other signals. The baring of teeth is often used as a threat or warning display—known as a snarl—or a sign of submission. For chimpanzees, it can also be a sign of fear. However, not all animal displays of teeth convey negative acts or emotions. For example, Barbary macaques demonstrate an open mouth display as a sign of playfulness which likely has similar roots and purposes as the human smile.^[21]

Gallery[edit]

The painting Mona Lisa by Leonardo da Vinci, which is famous for its subject's enigmatic smile.
Girl with closed mouth smile.
An open-mouthed smile
Politicians are often shown smiling as this is considered a sign of hospitality and confidence.
Artwork on this ball is a common abstract representation of a smiling face.
A Dutch footballer smiling
Mahatma Gandhi smiling
Dalai Lama smiling