4. Cosmetics
Both men and women can appreciate how cosmetics can help us stay younger looking and more attractive. What’s not as well known is that most cosmetics can be dangerous if not used properly. Many cosmetics such as eyeliner contain preservatives to keep dangerous bacteria from accumulating. Preservatives break down over time and can also be much less effective when cosmetics are mixed with water, or even worse, saliva, prior to application. That can lead to eye infections that could become serious.