Why teeth turn yellow?

First, because we see the color of the teeth, not only is the color of the tooth surface, including the apparent color of the dentin through the enamel of the tooth surface. The enamel color is white translucent, revealing the dentin color partial light yellow. When you think of your teeth is not enough white color, in many cases because of a relatively high degree of enamel mineralization, enamel colors are biased in favor of transparent color, in fact, so the teeth would be sturdier.

Oral hospital doctors, resulting in tooth colored, yellow, many reasons, in general, be divided into endogenous and exogenous two kinds:

Stain is due to the tooth surface with a variety of bacteria, they secrete viscous substances, diet tea, dirt, smoke stains, as well as drinking water, certain minerals and people's saliva minerals in the tooth surface adsorbed on these sticky substances on the formation dental equipment of plaque and tartar, gradually make the teeth yellow or black.

The coloring of the endogenous in the process of tooth development, such as tetracycline deposition in the dentin, it will make teeth turn yellow, brown or dark gray, known as tetracycline, If too much fluoride in drinking water may also be lead to dental fluorosis, white teeth appear before startling color, brown patches, pulp necrosis, the metabolites of the bacteria break down the pulp and tooth dehydration also make the discoloration of the teeth.

The coloring needs of the exogenous usually by cleaning teeth can restore the color of the teeth. Endogenous coloring, often you need to complete the chemical bleach How the process of filling or cover whitening. Methods of teeth whitening essence, only two, one is chemical bleaching, the other is to cover the whitening. Restore teeth qualities of the scaling, tooth brushing, strictly speaking, can not be considered to whiten teeth.