CoffeeAndMilkGetty Images IMHO, one of the best things about eyelash extensions is that they aren't permanent. (Irreversible beauty procedures—like brow tattoos, face lifts, or implants—require more commitment than I'm about these days.) The non-soluble glue used to affix synthetic lashes to your own hairs is so effective that in general, false lashes only fall off when your real ones naturally shed, usually within 10-20 days of your original appointment. At that point, in the best-case scenario, you then return to your lash specialist for a touch-up or for a full removal, where a proprietary lash adhesive remover is placed at the base of your lash line and allowed to sit for ten to fifteen minutes as glue bonds dissolve, explains Chanel Hillman, a lash specialist at Revive Salon & Spa. The technician then uses a microfiber swab to gently slide your old lashes off, repeating the process until all the synthetic fibers (and residual glue) are removed.