There are many reasons for yellowing of the teeth, the main causes being exogenous and endogenous staining, as well as yellowing of the teeth themselves.
1. Exogenous coloring: There are two common causes.
(1) Tea scale, tobacco stains and certain minerals in drinking water are adsorbed on the tooth surface, slowly making the teeth yellow. This type of coloring can be avoided by maintaining good oral hygiene or removed by routine cleaning.
(2) Carbohydrates containing aldehydes in the daily diet, fruits, baked goods, etc., through the Meladic browning reaction, or foods containing special groups and the sulfur-containing groups in the sticky proteins secreted by various bacteria present on the surface of the teeth undergo a redox reaction, resulting in staining on the surface of the teeth that is difficult to remove. This kind of exogenous coloring leads to yellowing of the teeth can go to a professional dental clinic to clean the teeth can be improved.
2. Endogenous staining: the most common reason is that the teeth are stained in the process of development, such as tetracycline deposited in the dentin, will make the teeth become yellow, brown or dark gray. Endogenous coloring makes teeth yellow can go to the hospital to do teeth whitening or do crown repair or veneer repair.
3. The teeth themselves are yellow: the original color of the teeth is determined by the transparency of the enamel on the surface of the teeth. If the transparency is high, then reveal the essence of the teeth is more, and the teeth are a little yellow, so the teeth are yellow, this is a normal color, do not need to worry.