A smile is professional. Smiling at work or during other professional occasions is not going to make you seem unprofessional. Quite the opposite, a smile will humanize you and make you appear more approachable. People will appreciate your recognition of their worth and of a job well done when you smile. A genuine smile is detectable by others because it is accompanied by a general glow, smiling eyes where the outer corners crinkle and the lower lid tightens, and a reassuring demeanor that helps the viewer to feel more at ease in your presence. A genuine smile comes from being happy, positive, and from drawing your feelings from the heart.
Nothing makes you smile lie feeling great, having lots of energy and knowing that you are treating your body with respect. So a great way to keep a smile on your face is to exercise, eat right, drink lots of water and get plenty of sleep. I think this is a no brainer, but very important none the less.
The difference between the frustrated smiles and the truly delighted smiles wasn't that obvious from still images. However, video analysis showed that the two types of smiles developed in different ways -- happy smiles tend to build up gradually, while frustrated smiles appeared quickly and faded just as fast.
To get a feel for how to make your eyes smile, stand in front of a mirror and practice smiling, but concentrate only on your eyes. You may find it helpful to cover the lower part of your face with a piece of paper. Play around with it a bit, and you'll find that you can make your mouth smile when your eyes aren't smiling, and you can also smile only with your eyes. When your eyes do smile, remember how it feels, which muscles are working and how. With practice, you may discover how to smile with your eyes at will by relying on your feelings and muscle memory.
See your dentist regularly for teeth check-ups and cleaning, as well as discussing options for teeth straightening, etc., if this is a concern for you. When you smile people will inevitably look at your mouth, so following these considerations will help you make a better impression, and, more importantly, a healthy mouth will make you feel more confident about smiling.Smiles make things right again and say much more than words can. If you've goofed, said something less than complimentary, feel lost or alone, or feel down, a smile can restore the balance. It lets other people know that you're prepared to be open with them, and that you're willingly agreeing to make amends where needed, like teeth whitening.