Cold light teeth whitening is a form of teeth whitening that can improve the color of teeth and is a common technique operated in dentistry. The cost is related to the operating procedure. It is usually around two thousand dollars and varies from place to place. The essence of cold light whitening is a chemical reaction that involves coating the teeth whitening agent on the teeth and then irradiating it with special wavelengths of blue light to release atomic oxygen through the peroxide of the tooth whitening agent, which penetrates into the hard tissues of the teeth to achieve the effect of teeth whitening. Tooth whitening is actually a redox reaction and may be reduced after a period of time, which means the teeth will become yellow again. The concentration of teeth cold light whitening is also relevant, and the cost of whitening will increase as the number of whitening sessions increases. Clinically common yellowing of teeth, or tetracycline teeth can be improved by cold light whitening. If the teeth are darker, a course of treatment may not work well and require another operation, and the cost will increase. You cannot eat colored things after teeth whitening, such as soy sauce or tea as well as coffee and chocolate, which can easily cause tooth staining. Generally speaking, it will disappear after 2 weeks. It is recommended not to eat too cold and too hot food to avoid further stimulation of the dental nerve, and to brush your teeth with anti-sensitive toothpaste. Pay attention to oral hygiene and keep the tooth surface clean. So the cost of teeth cold light whitening is generally about two thousand dollars, and pay attention to the care of teeth after the operation.