Yes, mascaras can ruin your natural eyelashes. But it depends on the quality or brand you are using. It also depends on how you are applying and how you manage it while it is in your eyes. Using this makeup product demands some care and attention. For example, you must always remove it before going to bed. Also, using water and tissue can cause massive damage to your eyelash. This is why it important is to use eyelash mascara removers to take the product off your lashes without causing any damage.