First of all, you need to know why the teeth are not white enough. In medicine, simple yellow teeth and black teeth are collectively referred to as tooth color. Generally divided into exogenous coloring and endogenous coloring. Simply put, exogenous coloring refers to the "external coloring" of teeth, which is mainly caused by food pigment coloring and smoke stains. Endogenous coloring is caused by taking some drugs or drinking water quality during tooth development, such as tetracycline teeth and dental fluorosis.

There are generally two treatments for tooth coloring: restorative treatment and bleaching treatment. The method of restorative treatment is to grind some natural teeth and cover them with artificial materials. Its advantage is that the color of teeth changes obviously, but its disadvantage is the need to grind natural teeth and the possibility of complications caused by pulp injury. Tooth bleaching therapy is a treatment method to change the color of teeth without grinding natural teeth. For example, the cold light whitening technology recently adopted by many hospitals and dental clinics is one of them. It uses a special cold light source to irradiate the bleaching agent covering the tooth surface, so that it can penetrate into the hard tissue of the tooth in a short time to achieve the purpose of changing the color of the tooth. Its advantage is that it does not damage the hard tissue of teeth, and the treatment time is about 30-45 minutes. But the disadvantage is that the bleaching effect will be different due to the action of drugs.

For people who need to whiten their teeth, dentists generally have four suggestions:

1. Go to a trusted medical institution. 2. For moderately and slightly discolored teeth, it is recommended to try conservative treatment (bleaching). 3. People with serious tooth discoloration or high requirements for changing tooth color are not suitable for bleaching treatment. 4. People who choose prosthetic treatment should have certain psychological expectations, such as the possibility of grinding off some natural teeth or hurting dental pulp.