Laser technology is also promising in the medical field. Laser can be used to treat myopia, cataract and other eye diseases. Laser treatment has the advantages of short time, low irradiation dose, no pain for patients, no need for anesthesia, safety and reliability, and short recovery period. Many tumors and diseases have been treated or controlled by laser therapy or combined with other traditional therapies. In dermatology, laser is used to treat pigmented diseases, eczema and dermatitis. Otolaryngology can use laser to remove tonsils, and Otolaryngology can use laser to remove hemangioma. Treatment of chronic rhinitis and epistaxis by laser cauterization and coagulation. Laser is also used to treat acute tonsillitis, reduce swelling, promote tissue regeneration and accelerate wound healing. In dentistry, laser can be used to drill holes and cut teeth, which shortens the treatment time and relieves the pain of patients.