Lash extensions are semi-permanent and are made from single strands of synthetic eyelashes that are curved to replicate a natural eyelash. They provide length and thickness to your own lashes and are available in varying lengths and thickness. Each lash is applied one by one to your own natural eyelashes. Normally a person’s natural eyelash falls out every 60 – 120 days and a new lash grows in. Therefore, it is necessary to get touch-ups every 2 to 3 weeks to add lashes to the new growth. Your natural lash cycle as well as how you take care of your lashes will affect how long the extensions will last.