Lipsticks and lip glosses should be discarded after one or two years of use. Even if the lotion, sunscreen, or makeup haven't reached the recommended removal date, it's best to get rid of them if you notice a significant change in texture, color, or odor. Lipstick doesn't contain many bacteria, so it can last between 12 and 18 months. Although lipstick and gloss are packed with preservatives such as parabens, essential oils and vitamins to ward off germs, they start to break down naturally after a year.
Regardless of when your lipstick expires, French suggests that you always discard the tube after an infection to avoid reinfection. However, as to when it expires, unless you've developed mold, Dr. Tanzi says it's only very likely that it will harden and crumble and therefore won't be applied as well as before. Liquid foundation generally lasts 12 months, while mascara and eyeliner only stretch for three.
Lip products usually last about two years, but may start to deteriorate sooner if used frequently. Compact products, because they are “solid”, generally last two years or more if stored properly, but keep in mind that efficacy and pigmentation will fade over time. Check when you should throw away the rest of your beauty products. All lipsticks have a 2-year lifespan.
If yours is over 2 years old, it's time to throw it away. You see, wearing an expired lipstick can cause irritation and inflammation on your lips. Therefore, in this case, prevention is better than cure.