The efficacy and functions of the teeth cold light whitening device mainly include the following aspects:

1. Remove plaque from the tooth surface: The cold light whitening device can remove plaque from the tooth surface through cold light irradiation, which helps maintain oral hygiene and reduce the occurrence of dental diseases.

2. Improve tooth color: The cold light whitening device can use a special beam and a special whitening agent applied to the teeth to remove plaque and calculus on the tooth surface through a redox reaction, making the teeth whiter.

3. Improve tooth quality: The cold light whitening device can not only remove stains on the tooth surface, but also improve the quality of the teeth to a certain extent and maintain the health of the teeth.

4. Repair teeth: For situations where the teeth are not arranged neatly and there are large gaps between the teeth, the cold light whitening device can help repair the appearance of the teeth by improving the color of the teeth.

Teeth whitening devices generally use high-intensity blue light with a wavelength between 480-520nm.

This specific wavelength of blue light can penetrate into the tooth surface and stimulate bleaching agents (such as hydrogen peroxide, etc.) applied to the teeth. When blue light shines on bleach, the bleach molecules are excited, releasing oxygen molecules.

These oxygen molecules will pass through the enamel layer and enter the dentin layer of the tooth, react with the pigment molecules, and decompose or convert them into colorless substances, thus achieving tooth whitening.