Usually, we put our mascara in our bag with all kinds of our sundries. Actually, bag is a breeding ground for bacteria. So, you should pay close attention to your mascara. Although most mascaras are protected by a tube & a wand, the antibacterial agent included can make only you safe for about 4-6 weeks. So, if you realize changes in the smell or the texture, throw it out. Don’t keep it until it’s used up. The longer you keep it, the more likely your eyes will be inflected. It’s not worth it.