Toothpaste has poor whitening effect.
The easiest way to whiten teeth is to brush your teeth with whitening toothpaste. Now there are various brands of whitening toothpaste in advertisements, but the oral cavity of Shanghai Second Medical University
Medical experts say that these whitening toothpastes have little effect, and their principle is mainly that they physically rub with the stains on the tooth surface through the friction agent contained.
Because of the low chemical composition, the brushing time is short and the whitening effect is very small. If there are obvious stains on the tooth surface, or because of smoking and drinking
Tea makes teeth yellow, and whitening toothpaste is completely ineffective.
The maintenance period of bleaching is short.
At present, the most commonly used whitening method is bleaching, which is suitable for a wide range of people,1people over 8 years old. However, for teeth with discolored dentin such as tetracycline teeth and dental fluorosis, it is difficult to achieve good whitening effect by using ordinary bleaching methods. The procedure of bleaching is: first, make a denture base according to the shape of the teeth, then put bleaching agent into the denture base, and then put the denture base on the teeth. The component of bleaching agent is generally urea peroxide with the concentration of 18 ~ 27%, which is a neutral component and reacts with pigment groups on teeth to restore the original color of teeth. This method should be carried out under the guidance of a dentist, which usually takes half a month to one month, and the longest is not more than three months. During bleaching, some people feel toothache and are sensitive to cold and heat, which is normal. In addition, everyone's tooth bleaching effect is different. In order to achieve the best whitening effect, it is necessary to bleach it repeatedly, but two or three times is enough, otherwise the teeth may be sensitive. New technologies vary from person to person.
Cold light whitening is to use blue cold light with a wavelength of about 480-520nm to quickly enter the teeth, so that the bleached components are physically reduced. bleaching agent
The process is about 1 hour. The price is relatively expensive, generally above 1000 yuan. It is best to repeat it every one or two years to consolidate the effect. The whitening effect of cold light is relative.
Obviously, but its ingredients can also irritate the gums, and the pain is very obvious when bleaching. Because everyone's physical condition and the degree of calcification of teeth are different, for
Many people's teeth will have a strong sensitive reaction to this bleaching method.
Porcelain teeth are not worth it.
The method of installing porcelain crown is to polish and modify the porcelain braces and bond them with the real teeth. It was originally used for broken and incomplete teeth.
Beautification, if the normal teeth are ground small just for whitening, and then braces are put on, is an extreme whitening method, which is harmful to teeth. Because you need it when you make dentures.
Acid etching is also to dissolve the enamel on the tooth surface so that new things can be put in. After finishing porcelain, you need careful care, otherwise your teeth will be white, but
Brought new dental diseases.
Tooth washing and whitening are indirect.
Xu, director of Shanghai Xuhui District Dental Prevention Institute, mentioned that tooth washing can often whiten teeth stains caused by tartar and coffee stains.
Although tooth cleaning is not used for whitening, it is mainly aimed at calculus and plaque on the surface of ordinary teeth. But if the tooth surface is covered with thick tartar, then
Ultrasonic cleaning is more suitable. In fact, regular tooth washing is also one of the most fundamental ways to keep teeth whitening.
Tetracycline teeth are difficult to turn white completely.
At present, there is no obvious, lasting and harmless treatment for tetracycline teeth in clinic. At present, there are mainly decoloration and acid etching composite resin repair.
Compound two methods. However, these two methods can not only improve tooth color, but also damage tooth tissue in different procedures. The long-term effect is not ideal, and
There are many complications and recurrent cases are common. Therefore, patients with tetracycline teeth should never neglect other more important functions of teeth for the sake of beauty.
"""Bleaching skills
1, there is an age requirement for bleaching teeth.
/kloc-Teenagers and pregnant women whose teeth are not fully developed under 0/5 years old, it is best not to bleach their teeth.
2, tooth bleaching must do dental examination.
Although tooth bleaching is relatively safe, it is necessary to ensure that dental caries and periodontal diseases have been treated before doing it, otherwise these diseases will be aggravated. People with unhealthy gums also
You can't do it blindly. Experts pointed out that patients with severe periodontal disease are prone to dentin hypersensitivity and even bleeding after using bleach.
You can't eat whatever you want after tooth bleaching.
Within 48 hours after tooth bleaching, you can't eat food that is too cold or too hot, and you can't drink coffee, tea, cola and other dyeing drinks. Prevent tooth decay
At this time, absorb more pigments. Within a week, it is best not to eat food that is easy to dye, such as spicy hot pot, or chew betel nut or smoke.
"""experts say
For the practice of using cold light whitening and porcelain crown to pursue tooth whitening at the expense of health and money, many dental experts have pointed out that tooth whitening and
While health needs attention, we must not ignore the most fundamental things just for fashion and beauty. Especially for domestic consumers who lack good oral hygiene habits.
For users, protecting dental health is the most important thing.
Tips 1, healthy teeth are not white.
Pale yellow and translucent milky white are signs of normal tooth color and healthy teeth. Teeth consist of crown, root and neck, which are exposed in the mouth.
The part of a decayed tooth that is not covered by gums is called a crown. The surface of the crown is covered with a layer of enamel, which is called enamel in medicine, and its normal thickness is about 2-2.5 mm. Tooth glaze
The texture is mainly composed of 96% inorganic matter, a small amount of organic matter and water. It is the hardest tissue with the highest degree of calcification in human body, and has good chewing wear.
Resist. The color of enamel is closely related to its calcification. The higher the degree of calcification, the more transparent the enamel is. Below the enamel is dentin, dentin
The composition is similar to that of bone, and the color is yellow or light yellow. Because the normal calcified enamel of adults is translucent, the color of dentin can penetrate through the enamel.
Therefore, the normal and healthy crown is light yellow and translucent and milky white. If you mistake the above normal tooth color for the so-called "yellow teeth" and accept tooth whitening, it will be great.
Very wrong.
Tips2。 Looking at the flowers and the moon in the porcelain fog, no tooth whitening product can absolutely meet the needs of consumers. Many consumers hope that their teeth will be as white and crystal clear as stars after decoloration. In fact, there is no product with such remarkable whitening effect unless it is to make all-ceramic crowns or porcelain teeth that need to be worn. Experts told reporters that the poor transparency of porcelain teeth is because there is a layer of metal inner tube inside the porcelain plate, which makes the surface of teeth look like dark chalk; Although full crown porcelain has natural luminosity and transparency, it is thin because it is pure porcelain, and its strength is much worse, so it can't bite hard things. Therefore, it is a painful and imperfect choice to make porcelain teeth or all-ceramic crowns. Tips3, good teeth should be protected from childhood.
In order to have healthy teeth, the most important thing is to care from childhood. The key to tooth development is the embryonic period of teeth. Therefore, when the mother is pregnant and the child is born,
In early childhood, the use of drugs should be cautious, otherwise it will affect the development of enamel and cause unhealthy teeth and pigmentation. In addition, drink less tea, coffee and red wine.
Color drinks, gargle after meals, especially quitting smoking. The American Dental Association also recommends drinking soda and sports drinks as little as possible, because it is harmful to tooth enamel.
Much more than coke. If you must drink it, in order to reduce the contact time between the drink and your teeth, drink it as soon as possible, instead of sipping it or using a straw.