Duchenne Genuine Smile

By Julia Thomas|Updated April 5, 2022
CheckedMedically Reviewed By Dr. Natalie Feinblatt, PsyD

A smile is one of the most powerful forms of nonverbal communication, and a genuine smile is known as a Duchenne smile. A smile could start a relationship or disarm a hostile partner. A smile provides comfort and is often contagious. Grinning shares our joy and masks hidden agendas. Research has shown that a smile is actually much more complex. 

a woman smiling - is it a duchenne smile, a genuine smile?

Learn To Spot A Fake Smile From A Heartfelt One.

On the surface, we associate Duchenne smiles or other grins with happiness. In addition to showing happiness, a smile can also convey embarrassment, self-doubt, deceit, arrogance, and even grief. By understanding the physiology behind smiling, we can understand when this gesture is genuine (a Duchenne smile) and when it is not. Nonverbal communication plays a big role in how we process interactions with others. Researchers tend to disagree on the actual numbers, but it is estimated that 60 to 93% of our communication is nonverbal. Whatever the exact number, it is clear that nonverbal communication significantly impacts how we relate to others.

What Is A Duchenne Smile?

The Duchenne smile is a genuine grin. This Duchenne smile was named after a French neurologist Guillaume Duchenne de Boulogne, a pioneer of the science of electrophysiology. In his research, he discovered genuine grins (or Duchenne smiles) incorporated two specific facial muscles:
  • Zygomatic major muscle: This muscle resides around the cheeks and turns the corners of the lips up.
  • Orbicularis oculi muscle: This muscle contracts around the eyes, resulting in the distinctive wrinkles often referred to as "crow's feet." It is also responsible for closing the eyelids.

A Duchenne smile requires both these muscles to work together. Other types of smiles only use the zygomatic major muscle. Duchenne argued only the "sweet emotions of the soul" force the orbicularis oculi to contract.

Research Behind the Duchenne Smile

Duchenne was fascinated with facial expressions and how people communicated using body language. In his research, he cataloged the muscles used for different facial expressions. He studied emotional expression by stimulating various facial muscles with electrical currents. Duchenne published a book in 1862 entitled Mecanisme de la Physionomie Humaine discussing his findings.
Much of his work on the Duchenne smile was forgotten in modern times until Raul Ekman and Wallace Friesen, psychologists at the University of California at San Francisco, captured the muscular interactions of 3,000 facial expressions using their Facial Action Coding System (FACS) in the 1970s. They found that the Duchenne smile was associated with an increase in activity in the brain's left anterior temporal region—an area connected with positive effect—as well as the left parietal region, which is stimulated by verbal activity. A renewed interest in Duchenne's work and Duchenne smiles showed how positive emotions directly correlated to Duchenne smiles. Some researchers believe the Duchenne smile is not just a brief spark of emotion, but a clear window into a person's core disposition.

The Duchenne Vs Other Types

The Duchenne smile is just one type of smile. Some researchers suggest there are up to 50 different types of smiles we use to communicate. Smiles convey a variety of messages, including fear, nervousness, deception, sarcasm, arrogance, concern, and more. Aside from the Duchenne smile, here are some other common types:


The tight-lipped smile is one of the most common forms of smiling. It happens when the lips are stretched across the face, but there is very little upward curl at the corners of the mouth. This smile is easily faked and used to be polite (unlike the Duchenne smile). A tight-lipped smile is common when meeting someone new or communicating with someone you don't particularly like.


Similar to the tight-lipped smile, the smug smile usually has the lips pressed together. One corner of the mouth may be raised; people tend to consider this as demonstrating superiority or satisfaction, not like the genuine Duchenne smile.


Also similar to the smug smile, the smirk can be used when questioning authority or displaying sarcasm. I suggest some kind of sneering or amusement, unlike the Duchenne smile.

Uneven Or Half

The uneven or half-smile has lips together or slightly apart, but one side of the mouth is usually raised while the other side is level or lower. This is often associated with tongue-in-cheek humor. It is also used when conflicting emotions are present.


Smiles can effectively show our affection or interest for someone else. Anyone receiving a seductive smile from a potential love interest may feel excitement or mutual interest. This is a slight smile often accompanied by other gestures like direct eye contact then quickly turning away. Because it can be used intentionally, it is not quite a Duchenne smile.

Tips For Spotting A Fake Smile

By understanding the muscles involved in Duchenne smiles, it is much easier to tell when a person's smile is fake or forced. Spotting a fake smile can make us more mindful of another person's nonverbal communications and their true intentions. Tight-lipped smiles, for example, could indicate the person is being polite, feigning interest, or unsure how they feel about you.

Here are three ways to spot a fake smile:

Duchenne smile

Learn To Spot A Fake Smile From A Heartfelt One.

  • The absence of eye movements: Duchenne smiles employ the orbicularis oculi muscle, which causes the eyes to close. If a person is faking a smile, their upper face will not move.
  • The absence of crow's feet: The orbicularis oculi muscle is also responsible for “crow's feet,” or small wrinkles, at the corners of the eyes. “Crow’s feet” are a telltale sign of a Duchenne smile.
  • Visible bottom teeth: During a Duchenne smile, the zygomatic major muscle moves upwards. When faking a smile, there is a tendency for this muscle to move outwards, sometimes exposing the bottom teeth.
Exploring the Benefits Of Smiling

Duchenne smiles are more than a sign of happiness. The benefits of smiling and the laughter that often follows can have a positive effect on your health and well-being. Here are a few of those benefits:

Releases Natural Feel-Good Chemicals Called Endorphins
The act of a Duchenne smile triggers the release of neurotransmitters called endorphins. These chemicals help lower stress levels and make us feel happier. Endorphins also act as natural painkillers, helping with chronic pain. As you increase your smiling, more endorphins are released into your system.
Boosts And Improves The Immune System
Smiling can help prevent and fight illnesses. When endorphins are released while beaming, they can reduce levels of a stress hormone called cortisol. Lowered cortisol levels have been associated with lower blood pressure, reduced body fat, a stronger immune system, and even a higher libido. Additionally, a study conducted on hospitalized children visited by storytellers and puppeteers showed an increase in immunity-boosting white blood cells an hour after the grin-inducing visit.

Spreads Joy And Uplifts People Around You

It's not often you hear that something “contagious” is also good, but smiling is both. When you see someone beam, the area of your brain controlling facial movements is activated, often leading to a reactive duchenne smile. Even in tense situations, a grin can be contagious and offer some relief. When you smile, you appear more positive and approachable to others. Genuine grins can convey self-confidence, a cheerful demeanor, and trustworthiness. 

Therapy Can Boost Your Smile

No matter what emotional or mental health issues might be taking up space in your life, pursuing therapy might be the key to unlocking a more frequent and powerful Duchenne smile on your own face. A recent study found that individuals treated for depression had more instances of Duchenne smiles following treatment than during their intake interviews. Furthermore, another study found that experiencing depression may inhibit one’s ability to recognize the Duchenne smile in others. Seeking support from a mental health professional, like the online therapists available through BetterHelp, can create positive change in your life through more genuine grins—on your own face and on those around you.

Online therapy is flexible and accessible; because you can arrange your sessions with a therapist around your schedule and lifestyle, you can meet whenever and wherever you’d like, via video chat, phone call, or text message. An online therapist will be able to help you understand your own emotions as well as those around you. Consider these reviews from BetterHelp users who have worked with online counselors to make emotional progress.

Counselor Reviews 

"I loved working with Patricia Chicca! She always has a smile on her face and something to help make you smile too. Her techniques may seem a little odd at first but they really do work when you put in the effort to use them. She is a wonderful woman and you don't have to feel uncomfortable about telling her anything, she was definitely here for me and not for money, and I'm sure she will be the same way to you." Read more about Patricia Chicca.
"Saying that I am EXTREMELY pleased with Reginald Burgess as my therapist is an understatement. While remaining professional at all times, talking to him feels like talking to a friend. He is attentive, empathetic, humorous, warm ( I could hear him smiling through the phone) and possesses a calm demeanor that quickly puts one at ease. These attributes created an environment that allowed me to feel supported and trusting enough to share my life's challenges, begin doing the internal work necessary to gain control and to heal.     I will be forever grateful for his expertise and  gentle guidance in helping me realize that I CAN live my best life. It is without hesitation that I'd recommend Mr. Burgess as your therapist. You won't regret it." Read more about Reginald Burgess.
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