With the pursuit of teeth whitening, teeth whitening technology is getting more and more advanced. Having a neat and white teeth is what every beauty lover expects. Since Harlan first reported the use of hydrogen peroxide for tooth bleaching in 1984, many bleaching methods have emerged clinically. Laser teeth whitening technology is a whitening method that has emerged in recent years and has gradually shown encouraging treatment results and a bright future in clinical application. Laser teeth whitening principle: Laser teeth whitening is a kind of in-office bleaching with the help of laser, bleaching drug with peroxide as the main component is applied to the colored teeth area and given laser irradiation, the bleaching drug reacts with the tooth pigment through laser irradiation, thus playing the effect of teeth whitening. The thermal effect of the laser facilitates the speed of whitening, and its safety and effectiveness have been recognized. Depending on the whitening requirements there are small and large scale bleaching. The micro-pain and sensitivity triggered by the deep penetration of bleaching drugs are reversible and controllable, without the need to take painkillers and without threatening the dental pulp, which is supported and proven by histopathological studies on the dental pulp. Laser whitening indications: 1, mild to moderate fluorosis. 2.Mild to moderate tetracycline teeth. 3, non-pulp discolored teeth due to discoloration of dead pulp teeth, internal bleaching after root canal treatment is the main, external bleaching is performed when necessary. Laser application precautions: 1, for physiological yellow teeth that need whitening can be used to whiten the whole mouth, currently most of the methods of cold light and laser whitening, laser whitening patient discomfort is the lowest, and can save 2/3 of the operation time. 2.Laser treatment is suitable for mild and moderate tetracycline teeth, and the effect of severe is poor, need to change to other restoration methods to solve the aesthetic problems. 3, postoperative care is critical, good brushing habits, light-colored diet, whitening toothpaste and the application of home remedy tray can maintain the treatment effect. In summary, whitening has several advantages such as significant effect, long protection time and complete peace of mind. The operation process does not touch the gums at all, which will not cause damage to the tooth structure, the operation time is short, which reduces the patient’s discomfort, a period of lunch break or after work, you can easily feel the magical effect of laser whitening, and more importantly, it can immediately make your teeth white, healthy and shiny! The one-time, non-stimulating, side-effect-free whitening effect lasts for more than two years, and is therefore recognized as the most effective and safest decoloration technology available.