1. You can choose a weakly acidic face wash. Do you know that the reason for good and bad skin is closely related to the pH (also known as pH) of the skin and cosmetics? (1) The 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 within the normal pH range, i.e. 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 should be washed twice, twice a day is enough to wash your face. The method is to place a little face wash in your palm, rub out the foam to wash your face, rinse with water, and then wash your face once more with face wash.