It can take two months or longer for an eyelash to grow to its full length and last about three months before falling out, states WebMD. Damage to the eyelash or the follicle can result in fewer, more fragile and shorter hairs when they regrow.
Eyelashes and their follicles are easily damaged, notes WebMD, so people should avoid pulling at their lashes and rubbing their eyes. Those who use eyelash curlers should avoid pulling on the eyelid. Women who wear mascara should remove mascara before going to bed to avoid eyelash breakage. Hair follicles on the eyelids may stop producing hair if they receive too much damage.