The simplest, convenient and cheap whitening method is to drink more water. To make water bright and transparent, we should pay attention to replenishing water. Supplementing the water in cells properly can not only help the normal operation of various organs, but also take away the old wastes in the body and help metabolism. Melanin hyperplasia at the bottom of skin caused by ultraviolet radiation can also be quickly removed by cell metabolism, and epidermal cells can be naturally replenished from the body, which is better than skin care products supplying water from the epidermis.