Many things in your home have a shelf life, and if they are out of shelf life, they must have been infected with many bacteria or allergens. For example, a third of the weight of a pillow that has been slept on for a year comes from the bodies of mites and dead skin on your body. For the sake of your health, do not throw them away. The following help you sort out the most likely to exceed the shelf life of the items in life but still in use. 1, toothbrush shelf life: 3-4 months A toothbrush head used for six months, containing 1.8 million bacteria, use it to brush your teeth once, equal to “swallow” the 6 sneeze saliva! Contact lens case shelf life: 3 months Once the contact lens case lid is opened, bacteria can easily find their way to your door, increasing the risk of eye infections. Contact lens case is also best not to put the bathroom, because the moisture is easy to mold, more likely to breed bacteria. 2, towel shelf life: 2-4 months “overdue” use of towels containing millions of bacteria, is likely to contain Chlamydia trachomatis and other disease-causing microorganisms, causing pore blockage, skin infections or trachoma. 3, pillow shelf life: 1 year There are tens of thousands to hundreds of thousands of bacteria in the hair. When sleeping, the dust and bacteria in the hair stick to the pillow, inadvertently left saliva, secreted sweat will also penetrate the pillow inside, breeding bacteria, causing skin allergies and diseases. 4, lipstick shelf life: 2 years The lipstick or lip gloss used every day is best replaced from time to time, because painted on the lips, the wet surface is susceptible to bacteria. 5, mascara shelf life: 3 months The moist and dark environment inside the mascara tube is the ideal environment for staphylococci to multiply, especially if you use mascara that has been opened for more than 3 months. 6, dishwashing cotton shelf life: 1 week Studies have found that 20% of dishcloths hide bacteria such as E. coli, Salmonella and other bacteria that can cause disease. Especially in the summer, some of the dishcloths are not clean enough to breed a lot of bacteria, so that the dishes in the washing process because of contact with the dishcloths and “cross-infection”. 7, bamboo and wood tableware shelf life: 6 months – 1 year Detergent can only wash away surface grease, but can not get rid of the bacteria hidden in the grooves of chopsticks cracks. Chopsticks used for more than a year can breed E. coli and mold causing diarrhea. 8, bath ball shelf life: 3 weeks A bath ball usually hides 7.2 billion bacteria, in addition to fungus, there are a variety of flora in the bathroom contaminated