There is no quantitative sunscreen on the market, and it is difficult to determine how much to squeeze out, so most people are very casual when using sunscreen. In fact, most people don't use enough. Professionals said, "Strictly speaking, after calculation, sunscreen should be two milligrams per square centimeter."

This is a very abstract concept, and most people simply don't know how to calculate it. If calculated on the whole face and neck of adult women, the dosage should be around1-1.25ml. If you want to be strict, you can buy a graduated teaspoon to measure it. If it is a rough dosage, it is recommended to use the amount of one soybean for a palm-sized range, and then use about four soybeans for a face.

According to this dosage, a 30 ml sunscreen will be used up every month. If you don't want to use it, the dosage is not enough, and the protection is not enough, which is equivalent to white coating.