Eyelash extensions have been a popular beauty trend for years. It has been revolutionized to where these lashes can look just as natural as a individual's natural eyelashes. This new technique is called Semi permanent, simply because these Eyelash extensions grow out with the natural eyelash. Our natural eyelashes are on a 30-90 day growth cycle, as a result, the Semi Permanent lashes will last between 2-3 months with proper care. As the life span cycle of your natural lash ends, the Semi- Permanent lash will need to be replaced. At this time a re-lash will be required. I reccomend every 2-4 weeks depending on the individual.