You can also use a clean mascara brush if you don't have an eyelash brush. Add a few drops of vitamin E oil to the brush, or apply directly onto the lashes. Vitamin E oil helps prevent lashes from shedding. Daily brushing stimulates lash growth and makes your lashes look softer and thicker.
People sometimes forget that eyelashes can get dehydrated, just like the skin. apply mascara, and applying it with your mascara should thicken your lashes.