According to statistics, each woman has to use an average of 12 different kinds of cosmetics every day, which inadvertently armed themselves with 175 different chemical compositions; at the same time, in the toiletries also exists in a large number of the same chemical composition. The following kinds of cosmetics and toiletries in the chemical composition is the most common, but also the most harmful. First, moisturizing creams and lotions. Protective ingredients containing hydroxybenzoates, which can easily lead to breast cancer and dermatitis and so on. Two, shampoo shampoo. Contains foaming ingredients such as sodium dodecanol sulfate and sodium lauryl sulfate, which can irritate the skin and lead to skin allergies and dermatitis. Third, hair care products, hand sanitizer. Containing our common formaldehyde, it will make the skin produce a burning sensation, and at the same time may lead to asthma, headaches and so on. Fourth, bubble bath. Containing sulfur, sodium and other irritants, long-term use may cause skin redness, allergies, headaches and other phenomena, and even lead to cancer. How to use cosmetics scientifically? First, avoid using a variety of cosmetics at the same time. The only basic skin care steps a person should do every day are: moisturizing, isolation, and sun protection. If you must wear makeup due to professional needs, you should also try to minimize the types of cosmetics. Second, many women often take the fragrance intensity as a measure of cosmetics ideal or not. In fact, the spice is only to meet the needs of people on the odor of cosmetics and the use of additives, the more complex the spice ingredients, the heavier the stimulus, the more likely to cause skin allergies and photosensitive reactions. Some studies have shown that some cosmetics in the preservatives, fragrances and pigments also contain toxic substances that can cause cell mutation and cancer. Third, do not “hunt” to choose new bath and make-up products, some traditional, old products rather more environmentally friendly, but also more healthy. In the purchase of cosmetics, as far as possible to choose a good reputation, large-scale professional companies produce brand-name products, do not want to buy and use cheap without labeling the factory name, address, production license or production date, shelf life of cosmetics. Cosmetics lead to “cosmetic allergy syndrome” its performance has the following conditions: First, the stimulating effect. Cosmetics in the synthetic chemicals such as pigments and spices in contact with the skin, can directly stimulate the skin to cause pruritus, neurodermatitis and other diseases, some young people now like black hair dyed yellow, unaware of the peroxide in the potion and ammonia, ammonium ammonium peroxynitrite can stimulate the scalp to make dandruff increase, scalp burning pain, hair brittle and easy to break. Nail polish remover – acetone, can make nails brittle. Second, allergic reactions. For some people with allergic qualities, in the use of certain cosmetics, such as lipstick in the permanent dyes dibromo and tetrabromofluorescein, as well as containing lanolin a variety of fragrances and preservatives in cosmetics, can cause allergic contact dermatitis. High concentrations of perfume, deodorant, hair milk in some allergies on the human body can cause a variety of allergic reactions, causing spasmodic cough, allergic rhinitis, conjunctivitis, urticaria and so on. Third, photosensitive reaction. Lipstick and other cosmetics absorb the energy of visible light, can damage the cellular deoxyribonucleic acid, so that the cell mutation, induced lip cancer. Sandalwood oil, lemon oil, etc. are light-sensitive substances, applying these cosmetics to the skin, cell damage will occur under sun exposure, causing inflammatory reactions. Pigmentation. Some cosmetics, such as pure jasmine oil, sandalwood oil, incense oil, etc. can cause some women to develop “pigmented cosmetic dermatitis”. Performance for the cheek or forehead diffuse, or patchy light brown pigmentation, sometimes there may be mild erythema or pimples, itchy feeling. To this end, the use of cosmetics readers are advised: first of all, carefully read the instructions and use according to the instructions, but also a small amount of cosmetics applied to the inner forearm, and so on, 24 hours later to observe any adverse reactions, such as reactions are prohibited, should not be used without the Chinese logo of the imported cosmetics.