Like extensions for hair, the eyelash extention is a cosmetic process where synthetic materials are applied to give a longer, fuller look. It used to be that an eyelash extention was accessible only to a limited consumer but eyelash extentions have become very popular and affordable these days. It has become so popular in some places that salons are booked as much as six weeks in advance. An eyelash extention comes in various lengths, colors and thicknesses and can be worn during sleep, swimming and showering. Unfortunately, excessive exposure to water and heat can weaken the adhesive bond. The extentions are different from fake or false eyelashes in that they are applied one by one and can last for up to six weeks. Be very careful that your eyelash extention professional is properly trained and certified. Doing it yourself is highly discouraged and could result in damage to your eyes. If they are attached properly, it will be painless and can take about 2 hours for a full set. A beautician carefully applies the "lash" with tweezers and a bonding agent. They are designed to bond with your natural eyelash. Since the eyelash extention will shed just like your own natural lashes, wearers are told to have them re-applied about every 2-4 weeks.