All types of laughter/frown lines or wrinkles can be prevented with a few easy steps every day.
Number one: Gently massage your face for 10-20 minutes every day, dont know why but my make-up artist says it works
Number two: Drink between 8-10 glasses of water a day it gives you a clear complexion and cleans your pores as well as preventing wrinkles
Number three: Instead of rubbing of make-up or rubbing at your face dap gently with a sponge or cloth this also prevents laughter lines.
source: http://www.toptipsforgirls.com/tip/1745/how_to_prevent_laugh_lines/
but according to http://www.bellaonline.com/site/BeautyBasics
One thing that won’t work is facial exercises. They may actually worsen deep facial expression lines by thickening the muscles of expression. That´s why we use Botox!