In humans, there are 75 to 80 eyelashes on the lower eyelid. The lower eyelid has 75 to 80 eyelashes, and the upper eyelid has 90 to 160 eyelashes in humans. The length of the eyelashes varies from person to person; they don't grow beyond a certain length (usually less than 12 mm) before falling out on their own. Humans, on average, have 90 to 150 lashes on the upper eyelid and 70 to 80 lashes on the lower lash line.
Although there is no clear scientific study to support this, it is stated that certain products such as coconut oil, biotin, vitamin E, eyelash growth serums and olive oil can be used to improve eyelash growth, length and strength. Usually, eyelash professionals must set aside a certain amount of time for each appointment, so an unlimited set would describe the number of extensions applied in that block of time.