As a general concept, mascara is not bad for your lashes. Some formulas may include risky ingredients or cause allergies, in which case they should be avoided. You can also damage your lashes if you misuse mascara. This includes curling with mascara on, not removing it at the end of the day, or adding too many layers. When you do remove it, you want to be gentle so that you don’t accidentally pull any hair out in the process. Finally, chuck out your expired mascara as harmful bacteria can be growing in that old tube.