Beautiful women, sweet and brilliant smile is as important as a beautiful body; handsome men, bright white teeth like snow and bronze skin, is an essential weapon. Therefore, nowadays, urban men and women, in addition to face focus on whitening, also turned their attention to the teeth, find ways to whiten teeth, thoroughly do “armed to the teeth”. Why do teeth become yellow? Why do teeth become yellow? In fact, the color of our teeth is not only the color of the surface of the teeth, but also the color of the dentin that appears through the enamel on the surface of the teeth. In early childhood, milk teeth are milky white, and as they grow older, they slowly turn yellow. There are various reasons for yellowing and staining of teeth, mainly divided into two types: exogenous and endogenous. Exogenous: Yellowing of teeth is due to the presence of many kinds of bacteria on the surface of teeth, which secrete many sticky substances on the surface of teeth. Daily diet such as drinking tea, coffee, smoking, etc. will leave pigments on our teeth, and these pigments are adsorbed on these sticky substances, gradually making the surface of the teeth yellow or black. Over time, these substances will also gradually penetrate from the surface of the teeth to the inside of the teeth, forming internal stains that will slowly discolor the inside of the teeth as well. Endogenous: Staining occurs during the development of tooth color. In addition to genetic factors, the most common, but often overlooked, yellowing of teeth is caused by aging. There are also many yellow teeth are pathological, generally due to: 1, health factors: teeth in the development process due to poor nutrition or had a disease, will make the calcification of the teeth will be affected, teeth will be yellow and brittle. 2, the factor of water quality: some areas, especially some mountainous areas, due to the high fluoride content in the water, too much fluoride drinking teeth will be yellow, and not 1~2 teeth, but a mouth full of big yellow teeth. However, fluorine has the effect of anti-caries, so these people are not easy to have tooth decay (tooth decay). 3.Drug factor: Now most people know that tetracycline drugs can lead to the occurrence of yellow teeth, especially children (before 5 years old) take more influence. 4, hygiene habits: some people do not pay attention to oral hygiene, no morning and evening brushing habits, the surface of the teeth accumulate a layer of food debris, soft tartar, tartar, tobacco stains, tea stains, etc.. These “yellow teeth” is not the teeth themselves yellow, is not pay attention to oral hygiene caused. Teeth whitening is essentially a procedure to remove stains and pigments from tooth enamel and tooth enamel. Depending on the shade of the teeth and the reason for their formation, different methods should be used to whiten them. Cosmetic dentistry is essentially a procedure that removes stains and pigments from tooth enamel and dentin. Depending on the shade of the teeth and the reason for their formation, different ways should be taken to whiten them. There are several types of teeth whitening in general: one is scaling Suitable for people: surface contamination of teeth, mild tooth discoloration. Advantages: immediate effect and maintenance of periodontal health. Disadvantages: only surface whitening, not whitening, the mouth will leave the taste of medicine, there are different degrees of sensitivity. Conventional is ultrasonic scaling, scaling is also known as having your doctor brush your teeth. Scaling generally has to go through four procedures: de-calculus, sandblasting, de-pigmentation, polishing, and the effect of whitening teeth by ultrasonic. For the kind of normal tooth surface discoloration, as long as the pollutants are removed, the teeth can be restored to white, scaling can be about once every six months, once about 100 ~ 200 yuan. In addition, you can usually use toothpaste with teeth whitening function and pay attention to less smoking and less colored drinks. Second, the drug rinsing method Suitable for people: for mildly pigmented teeth underdeveloped, yellowing teeth caused by ageing enamel change. Advantages: Bleaching under the guidance of a dentist is safe and convenient. Disadvantages: It is less effective for heavily colored tetracycline teeth and fluoride teeth because it can only be superficially white, not durable and easily causes tooth sensitivity. Pain index: almost painless (Special note: because it is only superficial whitening, it is necessary to use internal bleaching method for heavily colored tetracycline teeth and fluorosis teeth. This method is more damaging to the teeth and very painful.) The best adaptation of bleaching is formally orange and brownish discolored teeth, and it is most effective for yellowing teeth that increase with age, moderately effective for mild tetracycline and fluorosis, and less effective for heavy tetracycline and fluorosis because it is only superficially white and not durable. At present, there are hydrogen peroxide decolorization, comprehensive decolorization, etc. Generally, the price of such products abroad is about half of that in China, such as the American “Naiwaiite”, about 1200 yuan. The specific practice is that the doctor first according to the shape of your teeth to make a bracket, and then every night before going to bed to put the bleaching solvent into the customized bracket, worn on the teeth to achieve the bleaching effect of gradually remove stains. Drug decolorization is less risky, quicker and takes about three weeks to treat. The main component of common dental bleaching agents is 10% concentration of carbamide peroxide, which decomposes to produce 3.3% hydrogen peroxide, which easily penetrates into the enamel and dentin and breaks down the large pigment substances into small molecules, thus making the teeth lighter in color. Within 48 hours after teeth whitening, you should not eat too cold or too hot food, and you should not drink coffee, tea, cola and other drinks with staining effect. To prevent your teeth from absorbing more pigment at this time, it is best not to eat foods that stain easily, such as spicy hot pot, chewing betel nut, smoking, etc. for a week. In addition, regular dental checkups and cleanings can also maintain the whitening effect of your teeth. Clinical practice proves that bleaching agents are not harmful to gums and pulp, and it is safe, convenient and effective as long as bleaching is done under the guidance of dentists. Thirdly, resin veneers are suitable for people: more patients with black and yellow teeth, but with limited financial ability to accept porcelain teeth. Pain index: The surface of the tooth has to be worn off, so it will hurt. Painless can be achieved under local anesthesia, and the operation is not fearful. Advantages: good results and relatively easy to accept price. Disadvantages: There will be mild ochre color over time. Veneers are a layer of near-normal tooth-colored material applied to the surface of stained teeth to cover up the color on the teeth. The more widely used material now is resin, but because the resin itself is translucent, it works well for moderately colored teeth, and is not optimal for severely tetracycline teeth, etc. Photosensitive veneers can be kept for several years, but they are easy to fall off, discolor easily, cause swelling and bleeding of gums, and other disadvantages. However, because of its low price and simple and convenient operation, it is still being used in China. In addition, porcelain veneers are currently being promoted in China, with the advantages of completely covering the pigmentation, sturdy and durable, and aesthetically realistic. But the price is generally high, each are more than 2000 yuan Four is porcelain or porcelain veneers Suitable for the crowd: many black and yellow teeth, the financial ability of patients allowed. Pain index: to the overall grinding of the teeth, of course, very sore. Advantages: the effect is very good, stable nature, more durable, good taste. Disadvantages: the overall grinding of the teeth, the damage to the teeth can not be restored, and the future can only choose porcelain teeth. Porcelain is the most effective and longest lasting method, which can be used for decades. It is mainly used for severe cases of moderate and severe tetracycline, fluorosis, enamel hypoplasia, cracked, crippled and pitted teeth. The outer layer of porcelain teeth is made of high temperature resistant low soluble porcelain powder similar to natural teeth, and the inner layer is a gold set synchronized with the hot and cold expansion of teeth, which is fused by vacuum high temperature porcelain furnace firing compensation, the finished teeth have smooth surface, stable color, folding and wear resistance, and it is difficult to distinguish the real teeth from the real ones. And the use of special adhesives set on the original teeth, after a period of fusion will be integrated with the original teeth, from the appearance and function are better than other methods. As long as the usual attention to oral health care, brush your teeth, porcelain teeth like the real teeth grow again. However, porcelain veneers are not expensive and can be considered as the beauty of the dental aristocracy. It mainly has the following categories. Shoulder porcelain, ordinary porcelain, currently the most popular in China, generally in 600-800 yuan / piece. All-porcelain, realistic color makes it the beauty of Europe and the United States in recent decades preferred, generally more than 2,000 yuan per tooth. The future of all-porcelain will be popular to the general consumer groups, because the safety will also become the first choice of consumers. Gold porcelain, gold-platinum-palladium alloy for the inner crown, made of porcelain powder outside, in about 1500 yuan / piece. Five is cold light Suitable for people: exogenous pigmented teeth (coffee, tea stains, tobacco deposits), moderate to mild tetracycline teeth, drug discolored teeth and hereditary yellow teeth, etc. Whitening process: 1. Apply a layer of protective agent on the gum edge. 2.Apply whitening agent to the tooth surface. 3.Illumination by cold light whitening lamp (8~10 minutes according to the degree of tooth staining). 4.Remove the whitening agent, and apply a new layer of whitening agent. 5.This process is repeated three times. Cold light whitening is done by applying a gel to the teeth through cold light irradiation, and the gel can decolorize the teeth. So, cold light whitening is actually still whitening teeth through medication, and the laser is just an aid to the medication. But its advantages are still very obvious, because it is laser drug application, so it is very precise and very safe, and the time required is relatively short, usually one and a half hours. The Way to Beautiful Teeth: This is a fast and safe technique for teeth whitening. The low temperature cold light avoids the irritation of the dental nerve during the treatment. The main component of the whitening agent is hydrogen peroxide, which has been safely used for 10 years for tooth decoloration. In the hydrophilic drug and the whitening process that does not touch the gums at all, it does not cause any damage to the tooth structure and enamel, and is disposable and non-irritating.