A three-week lash fill-in is ideal for refreshing your lash extensions and maintaining their full, beautiful look. To qualify for this service, at least 30% of your lash extensions must still be intact. During the session, any outgrown lashes are removed, and new extensions are applied to replace those that have naturally shed. If less than 30% of lashes remain, or if it has been more than three weeks since your last appointment, a full set will be required. Regular fills ensure your lashes stay flawless and well-maintained while promoting natural lash health.