Recently, many people pay more attention to the beauty of their appearance because of the popularity of cosmetic fashion. White teeth have a good influence on the beauty of your appearance, making people like you. While yellow teeth will leave a bad impression on others. If you have whitening teeth, you can win trust and respect from others. You will not only keep a healthy body, but win more good opportunities for your own development .

Why do teeth become yellow?

    Structure of tooth can be divided into three parts, including enamel, dentin and pulp. Normal enamel is white , and dentin is slightly yellow. Therefore, normal tooth is white with slight natural yellow color. However,color of teeth would gradually become yellow because different people have different living habits and internal constitution.