You wouldnâ€™t think of eating food past the expiration date, yet many women apply the same makeup for years. Itâ€™s unsanitary and bad for your delicate skin. â€œCosmetics are made with organic materials so itâ€™s important to clean out your makeup bag and cabinet regularly,â€ says Cindy Joseph, a former makeup artist and CEO of the cosmetics company BOOM! By Cindy Joseph. â€œOnce the preservatives are past their potency, bacteria can grow creating possible infection â€“ and natural makeup turns rancid even quicker. As a rule of thumb, if it smells funny or looks strange, toss it. Cleanliness plays a big part in your health which contributes to your beauty.