10 Makeup Myths You Need to Stop Believing Immediately

If you've sworn by doing this in the past, you're not imagining things — it really does pack more of the formula onto the brush, as the extra oxygen is "thickening" the product. But in the long run, it's a bad move.

"You're reducing the lifespan of the mascara," explained Lujan. "The formula will dry out quicker." If you're hoping to extend the life of your favorite tube, Lujan suggests adding a few drops of a liquefying formula Make Up For Ever Aqua Seal ($21), which intensifies pigments and makes products more durable. "In addition to reanimating a dry mascara, it will also increase the waterproof hold," he said.