Veneer, also known as veneer, is a restorative method that uses bonding technology to restore the normal shape of the tooth and improve its color by covering it with restorative materials directly or indirectly bonded to the surface of the tooth with defects, stained teeth, discolored teeth and malformed teeth, etc., in the case of preservation of the living pulp, less grinding or no grinding of the teeth. 1, direct veneer repair is the use of light-curing composite resin intraoral direct shaping, curing, polishing, complete dental restoration technology. Its advantages are simple, flexible, once completed, but due to the influence of many factors of intraoral operation, veneer edge shape and surface texture is difficult to meet the ideal requirements; intraoral direct curing resin monomer conversion rate is generally low and seriously affect the quality of veneer; in addition, the chair-side operation time is too long to limit its clinical application. Resin veneers The biggest advantage of veneers made directly with resin in the patient’s mouth is that they are convenient, fast and quick. It can quickly improve the aesthetics of the patient’s anterior teeth. For the anterior teeth fluorosis, mild tetracycline teeth, too small teeth, gaps, traumatic teeth partially missing, if the patient is unable to accept the short-term cost of porcelain veneers and super porcelain veneers, is not lost as a short-term improvement in the aesthetic transition restorations. Indirect veneers are mainly made of ceramic or hard composite resin materials on the model. The production of indirect veneers is not subject to chair-side operation time limitations, it can be sufficiently modified shape, modification and polishing outside the mouth, and its repair effect is often better than the direct veneer. 2, porcelain veneer Porcelain veneer is the application of bonding materials will be thin layer of artificial porcelain restorations fixed in the affected teeth lip surface to cover the impact of aesthetic defects such as defective discoloration of a restorative method. As a kind of preservation restorative treatment means, it is widely used in clinical practice in recent years, especially suitable for cosmetic restoration of young permanent teeth and anterior teeth with large pulp cavity. Porcelain veneers have the advantages of beautiful color, small amount of preparation, anti-liquid resorption, good biocompatibility, anti-wear, periodontal health care and solid and reliable bonding. Porcelain veneers can be divided into three categories according to different production methods and materials: traditional porcelain veneers, cast porcelain veneers and CAD/CAM machined porcelain veneers. 3, hard veneers This technology is also called hard resin veneers, super porcelain veneers, porcelain veneers. Teeth whitening veneers are made of resin with a large number of porcelain particles, which not only improves the wear resistance of the resin, but also can greatly improve the aesthetic properties of the resin. The clinical procedure is similar to that of porcelain veneers. Advantages Veneers have excellent aesthetic effects on dental problems such as dental fluorosis, mild to moderate tetracycline, and slight misalignment of teeth, and minimize the damage to the patient’s teeth, so more and more people are choosing the form of veneers to repair their teeth. 1, safe grinding of dental tissue less. Porcelain veneers less abraded dental tissue, and in some cases even do not abrade the dental tissue, so that a large amount of dental tissue can be saved, do not need to kill the nerve, basically control the postoperative pulp inflammation, necrosis and other sequelae of full crown restoration, can maintain the long-term health of natural teeth. 2, beautiful simulation effect. Porcelain veneers simulation of the cosmetic effect, with the same optical qualities as the natural tooth tissue, does not contain any metal components, showing the best aesthetic effect, there will be no black line of the gums of the common porcelain teeth phenomenon. Porcelain veneers are available in a variety of different colors, and can be externally stained to fine-tune the color. Clinical bonding has a variety of different shades of bonding agent and white color masking agent can be used to assist in adjusting the color of the porcelain veneer, in order to achieve the overall coordination of the cosmetic effect. And the high abrasion resistance of the porcelain itself and not coloring can make porcelain veneers to achieve permanent whitening effect. 3.Healthy Small stimulation of the gums. Porcelain veneers have excellent light transmittance, dental preparation can be flush with the gums, which is conducive to the protection of gums and make impressions and bonding porcelain veneers. The area connected to the gums is also only on the lip side, less stimulation of the gums. There will be no discoloration of the gums caused by metal ions of metal porcelain teeth. Porcelain crowns are harder than enamel, which can cause wear and tear on the jaw teeth. The hardness of porcelain veneers is slightly lower than tooth enamel, which can effectively protect the jaw teeth. 4.Comfortable No oral sensation of foreign objects. Traditional porcelain dental restoration needs to grind the tongue side of the natural teeth, and the tongue side of the teeth are usually healthy, and with the tongue, the opposite teeth in the most coordinated state. It is impossible to restore even the best metal porcelain teeth to their former natural teeth. Porcelain veneer repair basically does not need to grind the lingual part of the tooth, can save most or even all of the lingual form, effective protection of the maxillary teeth, while the tongue is still in contact with the undamaged natural teeth, the touch is natural, comfortable, to avoid the tongue and the traditional ceramic teeth in contact with the “sense of foreign body”. Therefore, porcelain veneers have good comfort. Adaptation of the crowd Now the popular dental veneers can be divided into two kinds of resin veneers and porcelain veneers, is currently more popular way of dental aesthetics. However, it is not to say that veneer whitening is suitable for all types of teeth, and its adaptive population includes: First, the shape of the abnormal teeth, enamel hypoplasia, too small teeth, etc. Second, medium and heavy tetracycline, fluoride plaque teeth, etc. Third, caries to the incisal end of the incisal end of the caries. Caries caries to cut end defects or shallow surface caries in a wide range of teeth. Sparse teeth or mildly crooked teeth, do not want to do orthodontics but the bite is normal. Drug discoloration of teeth. Hereditary yellow teeth. Seven, serious cases of teeth with cracks, mutilations, pits. Do dental veneers patients should be more cautious, according to the individual situation, “the right medicine”, to the regular hospital treatment, in order to ensure the good results of the restoration.