Do you want to smile, and not smile fake? Want to have a great big beamer? Read on to find out how!

[edit] Steps

Think of your happiest memory. Maybe its a holiday with your friends where you had a laugh, or your first kiss... whatever it is, think back to it and just wait for the smile to creep onto your face!
Amuse yourself! Read a joke book or funny story, watch a comedy, or hang out with some naturally funny people!
Make yourself laugh! Do something that you used to do when you were little, like running around in the rain, or making sandcastles! Just acting like a little kid again will make you grin!
Forget about all the bad things for a second and think about everything good in your life! You might be surprised how much you have to smile for!
Get on the Internet, search for stories about people who overcame illnesses, or brave people who saved lives. Read stories about achievements, successes and bravery, and it should make you smile!
Do something that makes you feel proud of yourself! Study for a test and pass, donate to charity, do a sponsored run...whatever it is, it should leave you tingling with a feeling of 'I did something good'. Nothing makes you smile more!
Think of the other person as your best friend. Think of how happy you would be to interact with your best friend.

[edit] Tips

Don't smile a smile that will make people freak out.
The more relaxed you are, the bigger you smile.
Sometimes, less really is more. Smile with your cheeks, eyes or, better yet, smile with your heart.