Laser whitening is useful, but the effect after treatment varies from person to person due to various factors such as different skin quality of each person and different operating equipment. The principle of laser whitening is to use laser to break down the melanin in the deep layer of the skin and promote metabolism to discharge out of the body to achieve whitening effect. At the same time, it promotes collagen regeneration and pore reduction to make the skin tighter and more elastic. Laser whitening does not achieve whitening effect at one time, depending on the individual situation, it usually requires 3-5 times of treatment to have a better effect. In addition, laser whitening treatment has fast recovery and less damage to the skin, but also has a certain risk, improper operation may cause inflammation, tissue damage and other adverse consequences, to determine the treatment plan under the guidance of a professional doctor. After the laser treatment, the skin is in a sensitive state, there will be redness and swelling, pay attention to keep the skin clean and avoid infection. When you go out, do a good job of sun protection, to avoid exposure to the sun to make the skin dark spots, darkness, affecting the treatment effect. You can also eat more foods rich in vitamin C, such as oranges, tomatoes, kiwi, grapes and other fruits and vegetables, which can also play a role in whitening.