Eyelash extensions help make your lashes look longer and fuller, however, both the weight and toxic glue used in their application can be very damaging to the delicate lash strands. When eyelash extensions are worn for extended periods, they may accidentally damage your natural eyelashes. If you have frequently been using false eyelashes or extensions, use a conditioner for a few weeks until your eyelashes return to normal. Use false eyelashes sparingly and do not tug or pull on them. If your eyelashes break off excessively, discontinue the use of any mascara or eye products until your eyelashes return to normal.