It may so happen that your mascara dries or stiffens after some time. To bring it back to life, you can leave the bottle in a water bath for a few minutes, without submerging it up to the cap. It is absolutely not recommended to dilute it with water, as it could result in the proliferation of bacteria that would undermine the health of the eyes. Another very effective way to dilute mascara is to add a few drops of eye drops or olive oil to the cosmetic and mix everything with the brush.