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. [ 1]
Medical whitening method
There are essentially only two methods for tooth whitening, one is chemical bleaching, and the other is covering whitening. There are also methods of tooth washing, tooth washing and sandblasting to restore the original color of teeth. 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, ultrasonic tooth cleaning and so on. [ 1]
The following are some of the most commonly used whitening techniques for your reference.
The first patent whitening comes from the patented whitening technology of Meiyashi in London, England, which can whiten real teeth healthily without damaging any tooth tissue. On-site operation by a professional tooth whitening doctor. Under the safe configuration, the patented whitening glue can quickly play a role through the whitening instrument to produce whitening factors, so that the whitening factors can effectively penetrate into the dentin layer of teeth and degrade the coloring of dentin layer, thus restoring the brightness and whiteness of teeth themselves. No side effects, no harm to dental tissues and nerves. Because it is deep whitening, the effect can last for about 5 years. Cold light whitening
Cold light whitening is a new tooth whitening technology popular in Europe and America. It can not only remove the pigment deposition on the surface of teeth, but also enter the deep layer of teeth to achieve the effect of decoloration. According to clinical experiments, the effect of Linuofu cold light tooth whitening technology can improve the level of 5- 14 vita, which is not only better than similar products, but also more than 30% of the whitening effect of household braces. The operation process only takes 30 minutes, without side effects, and the whitening effect can last for more than two years.
Indications: dental fluorosis, tetracycline teeth, pigmentation, enamel hypoplasia, dental caries and dead pulp teeth.
Specific process:
1. Before the cold light whitening operation, the dentist will conduct oral examination and communicate with the whitening patients. People below 16, pregnant women and patients with severe periodontal disease are not suitable for this kind of tooth whitening.
2. Compare and record the color of teeth before whitening, and take photos for archiving.
3, whitening patients and operators wear goggles.
4. Mix the polished sand with a small amount of water and simply treat the tooth surface. After treatment, let the patient rinse his mouth and blow dry the tooth surface.
5. Put the moisture-proof cotton plug into the inner side of the lip, apply lip oil and cover it with paper.
6, put the mouth opener in the patient's mouth, to ensure that the patient without discomfort.
7. Apply the light-cured resin to the gum, covering the subgingival 0. 5mm, irradiated with light curing lamp for about 3 seconds.
8, the overall electro luminescent head, lamp holder should be 90 degrees perpendicular to the tooth surface, just contact the mouth opener.
9. Mix the hydrogen peroxide and whitening powder into a paste (note: the consistency is subject to the whitening agent dripping without a brush, and it should not be too thick), and apply the prepared whitening agent to the dried teeth above *** 16, with a coating thickness of about 2-3 mm..
10. Press the start button to start the first 8-minute treatment. After that, the machine will automatically stop, and then use a strong straw to suck the whitening agent off the teeth. Wipe the residual whitening agent on the teeth with a dry cotton ball if necessary, and do not rinse with water at this time.
1 1, repeat step 8~ 10 twice for the second and third 8-minute treatment courses.
12. If the patient has dentin hypersensitivity or pain, the whitening operation should be stopped.
13. Generally, two 8-minute courses of treatment can show obvious effect. Dentists generally recommend completing three courses of treatment, and the effect will be more ideal.
14. After whitening is completed, suck off the whitening agent, carefully remove the light-cured resin and tampon, rinse the teeth and gaps with water, and remove the mouth opener and goggles.
15, after teeth whitening, you can take photos and archive them.
Key points of postoperative nursing:
1, if the gingival margin of some teeth is bleached after cold light whitening, don't worry, this phenomenon will gradually return to nature within 24 hours. Some patients with dental fluorosis are not suitable for whitening agents because of sparse enamel, and stop treatment immediately if they are obviously unsuitable.
2. There are some patients with severe tetracycline teeth. The effect may not be obvious after the first treatment, but after the second tooth whitening treatment, the tooth whitening effect will be quite stable. As long as you pay attention to daily care, the effect can be maintained for a long time.
3, after cold light whitening, we must pay attention to avoid drinking hot and cold drinks within 24 hours, avoid teeth contaminated with colored substances, avoid drinking colored drinks such as tea, coffee, cola, red wine, and avoid smoking.
4. Regarding diet, it is best not to eat dyed food, such as spicy hot pot, betel nut, etc. within one week, and avoid washing teeth with pigment after cold light whitening.