It refers to the process of putting exogenous drugs on the surface or inside of teeth and reacting with teeth to make teeth white.

Why do teeth turn yellow?

Why do teeth turn yellow? In fact, the color of the teeth we see is not only the color of the tooth surface, but also the color of the dentin through the enamel on the tooth surface. When a child is young, his deciduous teeth are milky white. As he grows older, his teeth will turn yellow slowly.

There are many reasons for tooth discoloration and yellowing, which are generally divided into endogenous and exogenous:

Exogenous coloring is due to the existence of many kinds of bacteria on the tooth surface, which secrete many sticky substances on the tooth surface. Tea stains and smoke stains in daily diet, as well as some minerals in drinking water and human saliva are adsorbed on these sticky substances, forming dental plaque and tartar, which gradually turns 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 drinking water contains too much fluorine, it may also lead to dental fluorosis, white chalk and brown plaque on the tooth surface; If the tooth nerve is necrotic, the combination of hemoglobin and bacterial decomposition products will also make the tooth black.

The main chemical component of tooth whitening medicine is urea peroxide, which reacts with teeth in different ways to discolor teeth. There are mainly cold light whitening, denture whitening, toothpaste whitening, mouthwash whitening, drug whitening and so on.

There are essentially only two ways to whiten teeth, one is chemical bleaching, and the other is covering whitening. Washing teeth and restoring the original color of teeth can't be regarded as whitening teeth strictly.

Chemical bleaching includes plasma tooth whitening, laser tooth whitening and cold light tooth whitening. Covering teeth whitening includes porcelain teeth, tooth paste and tooth brushing paint (tooth filling). The whitening effect of general covering method is better than that of chemical bleaching method, because the whiteness of covering method can be controlled.

In particular, tooth whitening with dental paint is simple and easy to operate, and it does not need dentists and various professional equipment. It is suitable for whitening colored teeth such as tetracycline teeth and dental fluorosis, and the whitening effect, namely whiteness, is far stronger than various chemical bleaching effects.

1, plasma tooth whitening:

It also uses peroxide drugs to coat the surface of teeth, which is inactivated by plasma irradiation and catalyzes the redox reaction of drugs to achieve the effect of tooth whitening. Each course of treatment is about 1 hour, and it must be conducted in a dental clinic. All courses of treatment are 3 ~ 5 times, achieving the whitening effect that ordinary patients want. It usually makes the upper and lower rows of front teeth, and the buccal side. Four teeth on each side, 16 teeth, up, down, left and right, from the application center line.

2. Laser tooth whitening:

It uses a high concentration of bleaching agent (H2O2 hydrogen peroxide) with appropriate laser dosage to catalyze a special catalyst to enhance the bleaching effect of hydrogen peroxide, and bleach the organic pigment in teeth from carbon ring structure to hydrophilic pigment-free structure, thus achieving the effect of safe whitening. 2 1 century, I'm afraid it's your best choice for all you who stress speed and efficiency. It's OK once. A course of treatment is about 3 hours. Similarly, it must be done in the dentist's office. There are 16 teeth in front of the upper and lower rows, with buccal side. Although hydrogen peroxide drugs are used to treat tooth whitening. It is more or less harmful to the tooth itself and periodontal soft tissue, but it is within the controllable range, so don't worry too much. The discomfort of teeth and soft tissues will return to normal in about 3 ~ 6 days.

3, cold light tooth whitening:

The principle of the cold light whitening instrument is that the high-intensity blue light with the wavelength of 480-520 nm is transmitted through more than one mile of 12000 optical fibers, and then all harmful ultraviolet rays and infrared rays are irradiated on the special whitening agent coated on teeth through two optical lenses coated for more than 30 times, so that the whitening agent can be oxidized through dentinal tubules and pigments deposited on the surface and deep layer of teeth for many years in the shortest time.

This whitening technology can not only whiten teeth discolored by smoking and drinking coffee for a long time, but also have a good effect on tooth discoloration (tetracycline teeth, dental fluorosis), senile or hereditary yellow teeth caused by drugs.

Beyond cold light whitening instrument has undergone special optical treatment, and the irradiation temperature is lower than that of similar products in the United States, which reduces the discomfort caused to the tooth nerve during the operation. The product design is reasonable and does not occupy space. 24V low voltage, waterproof performance, absolutely safe to operate.

Beyond cold light whitening agent is mainly composed of hydrogen peroxide (H2O2) and silicon dioxide (SiO2) with a diameter less than 20 nm and other special whitening ingredients. It not only has a good whitening effect on teeth, but also makes teeth shine after whitening, which is incomparable to other products.

Tips for whitening teeth with cold light;

1, Q: Are my teeth suitable for cold light whitening?

A: In fact, everyone who wants to have white teeth can enjoy the magical effect of Beyond cold light tooth whitening treatment. This includes general exogenous pigment teeth (coffee, tea stains, cigarette stains), moderate tetracycline teeth, dental fluorosis, drug-induced discolored teeth and hereditary yellow teeth.

2. Q: How long can the whitening effect last?

A: The retention time varies with individual eating habits and dental institutions, and it is generally about two years.

3. Q: What should I pay attention to after treatment?

A: Within 24 hours after treatment, teeth are easily stained by colored substances again. You must avoid drinking tea, coffee, cola, red wine, berry drinks, colored toothpaste, mouthwash and eating dark food, and avoid smoking.

Preparation before tooth whitening

Many people will choose to bleach their teeth, but if you really decide to carry out this beauty project, you'd better make the following preparations:

1, go to the dentist first. This is because not everyone is suitable for tooth bleaching. Sometimes, after tooth bleaching fails, the color of teeth will be uneven. Tooth bleaching is most commonly used for people who wear false teeth.

2. If there are patients with dental problems such as periodontitis and gingivitis, it is not suitable for tooth bleaching. You may even need to have an X-ray examination to see if the internal condition of teeth is suitable for tooth bleaching. If there is really something wrong with the teeth, it is necessary to repair the teeth first, deal with the tooth problems well, and then bleach them. Otherwise, the problem of teeth may be aggravated.

3. Tooth bleaching may lead to side effects. Some people will have dentin hypersensitivity or toothache during bleaching. But when this process is over, that kind of sensitivity or pain will disappear.

Finally, healthy teeth are not really white. So don't bleach your teeth too white. Otherwise, it will be unnatural.

Whitening method of exogenous yellowing of teeth

Electric toothbrush can effectively reduce tooth stains caused by drinking tea and coffee and poor oral conditions, and restore the original color of teeth.

Experiments show that electric toothbrush can remove 38% more dental plaque than manual toothbrush, and its cleaning ability has been unanimously affirmed by dentists.

Oral B is the best electric toothbrush. Braun made it. The price ranges from 200- 1000, and the brush head can be changed. If you just want to whiten your teeth, use EB 18-2 and EB 17-2b. Remove dental plaque -EB 17-4, EB 18-2, EB 17-2b, EB 25-2, SR 18-2, EB 10-2k.

[Edit this paragraph] Advantages and disadvantages of tooth washing

There is no close adhesion between gum and root surface, but there is a shallow groove with a depth of 0.5-2 mm, which is called gingival sulcus. Normal gums are close to the root surface and are not open. The gingival sulcus is easy to accumulate food residues and attach plaque, which becomes a good area for bacteria to grow and reproduce. Because it is closed and difficult to clean, it often leads to gum inflammation and periodontal disease. In addition, it is difficult to thoroughly clean the area below the abutment. Simply brushing your teeth can't completely remove foreign bodies, which can easily lead to gum disease. Some people think that it is wrong to brush your teeth carefully every day. Because new dental plaque will form within half an hour after the teeth are thoroughly cleaned, it can reach the maximum amount within 30 days, and it will become dental calculus over time (just like soft dirt accumulated in a kettle). But this is an accumulated bacteria. Can cause gingivitis, periodontitis, bleeding, bad breath, and finally lead to tooth loosening or even falling off. Therefore, if adults have not cleaned their teeth, they should go to the hospital as soon as possible to have their teeth cleaned, preferably once every six months to one year.

What people commonly call "tooth cleaning" is medically called "tooth cleaning". The so-called "cleaning" means removing dental plaque such as bacteria, tartar and pigment from the tooth surface; And "treatment" means that it is one of the basic methods to treat periodontal disease. Inflammation of gingivitis and periodontitis can be relieved by tooth washing, but periodontal disease cannot be cured by simple tooth washing. To eradicate periodontal disease, further diagnosis and oral professional treatment should be carried out after tooth washing. So the main purpose of tooth washing is to prevent and treat oral diseases, not just to look good.

In developed countries, tooth washing has become a very popular routine oral health care, and people regularly go to the dentist to wash their teeth once or twice a year. After tooth washing, if periodontal disease is found, the dentist will conduct professional oral treatment in time to maintain oral health. Tooth washing is a highly professional technical work. In stomatological hospital, it takes about three hours for medical staff to wash their teeth with manual instruments (which are basically not used now), and it takes about one hour to wash their teeth with ultrasonic dental scaler. According to patients, it only takes 10 minutes to clean teeth in some dental clinics or beauty salons. Regular dental medical institutions will definitely not do this. It is very harmful to wash teeth in irregular places. First, only visible tartar is removed, leaving deep tartar with the strongest pathogenic effect, which can not achieve the purpose of preventing and treating periodontal disease. Second, the damage to the gums, especially the root exposure after tartar removal, can not be further treated in time, which not only leads to unbearable pain for patients, but also aggravates the condition of periodontal disease. Third, it is easy to cause cross-infection and bring undue regret to people. Therefore, we should carefully choose the place to wash our teeth, and go to a regular hospital to find a strictly trained medical staff to wash our teeth.

So why do teeth feel strange or allergic after tooth cleaning? After tooth cleaning, the gap between teeth is wide, will the teeth loosen? Actually, tartar is like a big cotton-padded jacket. Once you take off your teeth and expose them to a "long-lost" environment, you will have all kinds of strange feelings. If it is healthy teeth, after a period of time, the strangeness will disappear. If the gap between the teeth is large, it means that you have periodontal disease and the gums have shrunk, giving people the illusion that the gap between the teeth has widened after removing calculus. This is not caused by treatment, but the cause of periodontal disease itself. If the tartar is not removed in time, the gums will further shrink, leading to periodontal disease and eventually tooth loss.

Some patients ask if tooth cleaning will hurt teeth ... objectively speaking, there should be, but it is very slight. Tooth washing will cause tiny scratches on teeth that can be seen under electron microscope, but they are very slight, and the damage caused by dental calculus to human body can be ignored, and professional technology and appropriate vibration frequency will minimize this damage.

The above are some questions about tooth cleaning, hoping to relieve some patients' doubts and puzzles. If you have never washed your teeth, you should. Remember, tooth cleaning is just like cleaning a room, but it is operated by professionals once a year to once every six months.