This lesson is an important part of beauty basics that not many girls know about and that is when to toss your makeup. I know it sounds crazy, that makeup actually has an expiration date! But it does and though you might think it won't do much harm, it can change the way your makeup looks and feels and even in some cases become harmful to your skin. Using expired eye products can cause infection to your eye. For example, mascaras are a liquid based product which is a great medium for all kinds of bacteria, by using the old mascara you are transferring the bacteria directly to your eye! Same goes with liquid foundation but instead of going to your eye, that built up bacteria is seeping into your skin which can cause acne breakouts, irritation and in some cases infection to your skin. A few signs to look out for that might suggest an expired product are a change in texture, color and even smell. When your foundation develops a weird smell and starts to separate toss it right away. Below are a few products with their corresponding "trash it' date. I would suggest keeping track of the day you purchase an item so you can refer back to it when the time comes to maybe get rid of it.