Eyelash extensions are used to enhance the length, curliness, fullness, and thickness of natural eyelashes. The extensions may be made from several materials including mink, synthetic, or human hair. The main method of applying the extensions is by using an adhesive glue to individually stick the extensions to the eyelash line. The lashes are placed hair by hair on your own lashes, so that your own lashes are therefore extended. False eyelashes and eyelash extensions are not the same. Just like natural eyelashes, the extensions fall out. They needed to be filled up about every 3 weeks.