Cold laser is a kind of laser with shorter wavelength, which can have certain damage to shallow tissues, but will not damage deep tissues and cause less damage to tissues, so cold laser technology has the advantages of relieving disease symptoms and fewer side effects, and is now mainly used in the treatment of correcting eyesight, removing spots, analgesia, and oral diseases: 1. Correcting eyesight: Cold laser, i.e. excimer laser, is used for correcting eyesight with precise control by the computer and precisely according to the degree of myopia. The degree of myopia according to different shapes and depths to change the corneal curvature and refractive power, to achieve the purpose of correcting vision, and does not damage the structural integrity of the eye; 2, removal of spots: can be used for freckles on the surface of the skin, coffee spots, age spots of the removal of spots treatment, the laser breaks down the pigment, so that the pigment is decomposed, when the pigment is decomposed, it will gradually be absorbed, and the pigmentation will be lightened; 3, analgesia: the cold laser technology has an analgesic effect, laser can be Strong nerve block, promote the release of analgesic substances, reduce the excitability of peripheral nerves, thereby relieving the patient’s arthritis symptoms, such as lumbago, leg pain, neuralgia and other symptoms; 4, the treatment of oral diseases: laser irradiation can promote the growth of neovascularization and the proliferation of granulation tissues, stimulate protein synthesis, which can effectively kill the bacteria in the oral cavity, alleviate the pain, treatment of periodontitis, endodontic inflammation, gingivitis, and so on. It is not recommended that laser surgery intolerant people, keloid body, pregnant women, etc. for cold laser treatment. If there is a need for treatment, you should first go to a regular hospital for relevant examinations, and be clearly diagnosed by the doctor combined with the clinical symptoms to give a reasonable treatment plan.