Reason: Lactic acid bacteria in the oral cavity adhere to the enamel surface to form plaque, and the bacteria in the plaque continuously decompose food, producing a lot of organic acids, which corrode the teeth with hypoplastic enamel, and the color of the teeth gradually changes from white to brown-black.

Scheme: Pay attention to oral hygiene, and wipe off the food residue left on the tooth surface after meals or with a clean towel.

Three ineffective ways to whiten teeth (this is what I saw on the internet)

Tooth whitening has become one of the most concerned and popular tooth beauty projects. But, you know what? Some tooth whitening methods are not suitable for you, so you must find an experienced dentist for a comprehensive examination for the first time, and the doctor will make a whitening plan for you. Don't blindly buy whitening products or bleach teeth.

Ordinary bleaching has no effect on endogenous tooth coloring.

Common bleaching methods: whitening denture base, whitening chewing gum, whitening toothpaste, whitening element, etc.

Use price: tens of yuan to 500 yuan, toothpaste and whitening agent are cheaper.

Usage: The whitening agent directly acts on teeth, and achieves the effect of whitening teeth through the redox reaction between hydrogen peroxide and tooth surface.

Whitening effect: This method has a certain effect on exogenous tooth coloring, but it has little effect on endogenously colored teeth such as tetracycline teeth and dental fluorosis, because the inside of the teeth is black or yellow, even if it is bleached at that time, it will often return to its original color in a few months.

The doctor suggested that many new whitening products, such as new generation tooth whitening agent, laser whitening, cold light whitening, etc., have similar principles to the above methods and have certain effects on endogenous tooth coloring, but their service life is longer than that of healthy teeth, and it depends on the degree of tooth discoloration. It is recommended to listen to the doctor's advice before using related products for the first whitening. If the coloring is serious, consider porcelain crown or veneer.

Tips:

There are many reasons for the yellowing of teeth, which are generally divided into endogenous and exogenous: exogenous coloring is because there are many kinds of bacteria on the surface of teeth, and many sticky substances are secreted on the surface of teeth. Some minerals in daily diet, tobacco stains and drinking water are adsorbed on these sticky substances, which gradually make teeth yellow or black. Endogenous coloring is formed during tooth development. If tetracycline is deposited in dentin, it will turn teeth into yellow, brown or dark gray, which is called tetracycline teeth. If the drinking water contains too much fluorine, it may also lead to dental fluorosis, white chalk and brown plaque on the tooth surface. If tooth nerve necrosis is combined with bacterial decomposition products, it will also make teeth black.

Bleaching and whitening methods are ineffective for tartar.

Whitening method: through the interaction between hydrogen peroxide and teeth, the effect of bleaching teeth is achieved. This method is quick and the cost is moderate. However, if your yellow-brown teeth are only caused by thick tartar on the surface of your teeth, even the most powerful bleach can't do anything about it. At this time, regular tooth cleaning and good living habits are the best ways to whiten teeth.

Experts remind: when it comes to tooth washing, everyone may be familiar with it, because every clinic and hospital has tooth washing business, but the effect after washing is very different. Dr. Zhang Ke said: Not all dentists are qualified to clean their teeth. The skill and technique of doctors determine the effect of cleaning their teeth. That's why sometimes I don't feel particularly uncomfortable after washing my own teeth, but sometimes it hurts and dentin allergy lasts for a long time. Therefore, you should choose a doctor first, and then choose a hospital. After washing, the teeth should feel fresh, the discomfort will disappear soon, and there is no persistent swelling and pain in the gums. In addition, exogenous coloring can cooperate with whitening toothpaste to continuously whiten after scaling, and satisfactory whitening effect can be obtained.

Porcelain and veneer are not once and for all.

For teeth with dentin discoloration, such as tetracycline teeth, macular teeth and dental fluorosis, it is necessary to use common bleaching methods to a certain extent. If it exceeds a certain extent, it is difficult to achieve good whitening effect, and these methods will stimulate teeth to some extent and are only suitable for some people.

Veneer whitening is to put a layer of porcelain or plastic veneer on the tooth surface to cover the discolored teeth. The cost of setting a tooth varies from100 to 200 yuan, and it will turn white immediately after setting. Now the veneer has more colors and more realistic appearance, which is very popular with consumers. But it can't be done once and for all as some people think, which is inseparable from the level of doctors and their usual maintenance. If the treatment is maintained well, it can last for several years or even longer. If it is not well maintained, it will soon wear out.

The method of porcelain-fused-to-metal crown is to polish the finished porcelain-fused-to-metal braces and stick them on the real teeth, which is more comfortable, natural and firm than veneering. Because the bacteria on the surface of porcelain teeth can not survive, there will be no tooth decay, which is superior to real teeth. However, no matter how good the materials and technology are, we must also rely on our own good sense of protection, because when making dental trays, we must use acid to corrode and melt the enamel on the tooth surface before putting new things on it, which is the first step to form dental caries. Therefore, after porcelain and veneering, we should use special toothbrush and toothpaste to care for our teeth carefully, otherwise our teeth will turn white, which will bring new dental diseases.

Experts remind: It is important to pay special attention to that both porcelain and veneering should be carried out after periodontal disease is cured, because patients with periodontal disease often lead to gingival atrophy, periodontal pockets, and finally root exposure and loose teeth. Adding veneers and porcelain crowns to such teeth will increase the periodontal burden and aggravate periodontal disease.

References:

www.YLBJ.com