1, cleanser can choose a weak acidic Do you know the reason for good and bad skin and skin and cosmetics pH (also known as pH) is closely linked? (1) Normal skin surface pH is about 5.0 to 7.0. (2) It can be as low as 4.0 and as high as 9.6. (3) The average skin pH is about 5.8. The skin surface is often weakly acidic because of the acidic substances such as urea, uric acid, salts, lactic acid, amino acids and free fatty acids stored on the human skin surface. The pH of healthy oriental skin should be between 4.5 and 6.5. Generally, the more oily the skin, the lower its pH value, the more partial to the sexual skin, the higher the pH value, and biased towards alkaline. The PH value of men’s skin is lower than that of women. Specifically, the PH value of neutral skin is generally between 4.5-6.5; the PH value of oily skin is ≤4.5; the PH value of dry skin is ≥6.5. Because the PH value of skin is weakly acidic, it has the effect of inhibiting the reproduction and growth of bacteria on the skin surface. Only when the skin is in the normal pH range, that is, in weak acidity, can the skin be in the best condition to absorb nutrients, and then the skin’s ability to resist external erosion, as well as elasticity, luster, moisture, etc., are in the best condition. It can be seen that pH value and safe beauty are inseparable. 2, each time you wash your face twice, twice a day is enough. The method is to place a little face wash on your palm, rub out the foam and wash your face, rinse with water, then wash again with face wash.