Do eyelash extensions fall out over a period of time? Red Lotus in Portland, Oregon talks about eyelash extension shedding.
Since each lash extension is attached to a single eyelash, they will fall out naturally along with the natural growth cycle of each lash. We recommend a touch-up every three to four weeks.
When an inexperienced professional applies lashes, he or she often applies one synthetic lash to three to four natural lashes, causing clumps or the lash to break and fall out. In addition, your lashes might fall out if you pick at them or try to pull them out yourself, which is a big no-no. But if you avoid those two problems, your lashes should stay intact.
For more information, please see http://www.redlotusskincaresalon.com/lash-extensions.html