Pay attention to the following points when using sunscreen correctly: (1) Choose different SPF according to the occasion? The value of sunscreen. The selected sunscreen should not only have the function of preventing UVB (sunburn), but also have the function of preventing UVA (aging and wrinkles). ? You'd better wash the sunscreen in time when you get home. ? Sunscreens with SPF of 10- 15 and SP+ can be selected for daily life, those with SPF of 15-20 and SP++ for shopping, those with SPF of 20-30 and sp++ for traveling, and those with SPF of 30 or above for swimming and sunbathing. ? (2) The damage of ultraviolet rays to the skin will exist even in winter, indoors and cloudy days. On cloudy days or in the shade of trees, the intensity of ultraviolet rays will only decrease by about 30%. Therefore, we should insist on using sunscreen all year round, rain or shine. ? (3) It takes some time for sunscreen to absorb and take effect, so it should be applied 20-30 minutes before going out. ? ⑷、SPF？ Value can't be accumulated, and it can't be used after makeup. When using sunscreen, it is best to remove makeup before applying it. ? 5], sunscreen use needs to reach a certain thickness to be effective. Too thin can not achieve the desired effect, too thick will cause a burden on the skin. ? Studies have shown that in order to achieve the effect of sun protection, at least 2 mg of sunscreen should be applied to every square centimeter of skin, 2-2.5 g to each arm and 1- 1.5 g to the face. ? The amount of sunscreen is more than that of cream, at least the size of a dollar coin. A bottle of 30ml sunscreen is used up in summer for about a month.

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