'Smile please' is every photographer's favorite line. Smile not only makes the photo look good but also keeps a person healthy. A smile can make the beginning of the day beautiful, a smile can take away someone's sorrow and this smile has the power to make even a stranger your own. Why does a smile have so much power? 

A perfect smile should be 13 to 17 degrees!
Some people consider Mona Lisa's mysterious smile to be perfect, while some consider Hollywood actress Julia Roberts' smile to be perfect. However, according to Healthline, a perfect smile means that the angle of the face should be 13 to 17 degrees. The eyes should not be closed while smiling. If the mouth is small, the teeth should not be visible and if the mouth is big, it is better to show more teeth. Teeth, gums, and lips play an important role in making the smile beautiful. For this, it is also important to pay attention to oral hygiene.   

Smiling face keeps pain away According to a study done in
Walden University of America, smile increases mood-enhancing hormones and reduces stress hormones called cortisol and adrenaline. This reduces blood pressure and reduces pressure on muscles, which leads to the production of endorphins in the brain. This is a kind of chemical that removes pain and stress. For people who have body pain, a smile is like a painkiller.     

The first thing a child learns is to
smile. Smiling is an expression that a newborn learns as soon as it is born. According to a study, children laugh 300 to 500 times a day but adults smile only 18 times a day. Besides humans, monkeys also smile. Smiling also keeps mental health good, i.e., people who smile are never bothered by anxiety, depression, and loneliness. 

19 types of smiles
Smile is a global expression. A smile on the face is understood by other speaking people living in every corner of the world and they too smile on seeing a smile. In 1974, an author named Leonard Rubin had divided smiles into 19 types. This was based on the expression made by the muscles and teeth. He associated 6 types of smiles with happiness. Some other smiles were associated with embarrassment and some were described as fake smiles. He had written that when someone fakes a smile, their muscles stretch in such a way that slight wrinkles are seen on their face. Fake smiles are controlled by the motor cortex of the brain, whereas a smile that comes from the heart is controlled by the lymphatic system of the brain. 

Look at yourself in the mirror and smile.
Psychiatrist Priyanka Srivastava says that a smile is a positive expression. When someone smiles, the brain gets a signal that the person is happy. Due to this happy hormones are released. Every facial expression is a mirror of the heart and a smile is associated with happy emotions. If someone is going through depression or any problem, then we ask the patients to smile while staring at themselves in the mirror. This is called the mirror technique. This affects the brain and the stress hormone cortisol stops getting released.

Every smile is unique.
Just like our fingerprints are unique, our smile is also unique. Smile is the unique identity of every person. Smile is so powerful that it helps a person progress rapidly in their personal and professional life because a smile makes them friendly, trustworthy, and confident. No one ever feels bad about a smiling face and due to this, there is never any conflict.  

Lifespan increases: According to a study by
Harvard Medical School, smile is also connected to age. People who smile more have a long life. Also, they do not fall prey to cancer or any kind of infection. This fact was also accepted in the journal of the National Academy of Sciences . People who smile are optimistic. They do not panic even in the face of the biggest problems in life. Such people also have good immunity. 

Smiles are being designed:
Nowadays smiles are also being designed to make the face beautiful. For people who have yellow teeth or crooked teeth or gaps in their teeth, their smile is corrected. This is called cosmetic dentistry. This makes both the teeth and the smile beautiful. Some people like to get lip cross smile done. In this, the measurement of the lips is taken and the smile design is made on the computer. After this, some transparent chemicals are applied to the lips so that the smile is of the desired shape. Besides this some get laminated surgery done on the lips for a perfect smile.