Yes, damaged eyelashes can grow back. Just like the hair on our heads, eyelashes have a growth cycle. The eyelashes on the upper eyelid typically have a growth cycle of about 30-45 days, while the lower eyelashes have a slightly longer growth cycle of about 60-90 days. When eyelashes are damaged or fall out, they will typically grow back within a few weeks. However, if the damage is severe or the underlying cause is not addressed, the eyelashes may not grow back or may grow back abnormally. It is always best to consult with a healthcare provider if you are concerned about the health or appearance of your eyelashes.