Basic natural colors of enamel - three: yellow, yellowish-white and bluish-white. And more than twenty colors. But many of us do not care about the wealth of natural palette, see his smile want only one color - snow white. Why not - modern dentistry every whim of the client's teeth. First on contraindications to whitening. In women, this pregnancy and lactation. Regardless of gender, this procedure should not be resorted to if you are allergic to components of the drug (peroxide compounds and latex). And if the patient has a disease of teeth or gums in the active stage, before whitening should always fully treat. The results of bleaching are not the same for all. For example, it is best able to cope with the pigment coating, dental plaque, as well as age-related changes of color. Difficult to whiten innate color change (the so-called tetracycline teeth). As a rule, yellow or brown coloration lightens lighter than the gray. On-chemical? There are several ways to lighten the tooth enamel. Typical chemical bleaching. The method is based oxidation processes resulting from the impact of atomic oxygen on the natural tooth tissue. Gums during the procedure protects the special protective gel and latex plate. Usually used 35% carbamide peroxide or hydrogen. The solution is applied to the teeth of the patient approximately 20-30 minutes, after which the teeth become whiter. The method can hardly be called gentle, it causes pain and is absolutely not suitable for people with problem teeth and sensitive tooth enamel. Fortunately, in recent times, this method is used less and less. Fotootbelivanie - a relatively new method. As the main ingredient is hydrogen peroxide gel. The difference between this method is the impact on the whitening of the halogen light. The patient sits under a lamp for 8 minutes, and so 3-4 times during a single session. For fotootbelivaniya can use various lamps (helium-neon, plasma, UV, etc.) Under the influence of light from the active substance, oxygen, splitting a dark pigment of the tooth. Disadvantage of the method - low efficiency, especially at very yellow (so-called tetracycline teeth). Dignity - democratic price (about two times lower than, for example, in the form bleaching). Laser whitening - a more effective method than the previous. When fotootbelivanii used diffused light of a lamp, but in this case, a focused laser beam, which acts on each tooth individually (for 1,5-2 minutes). Therefore the result of laser whitening will be more impressive. Bleaching occurs not only at the expense of hydrogen peroxide, but also due to the ability of the laser to cleave the dark pigments. This method not only not harmful to teeth, but even strengthens them. Studies have shown that the hardness of enamel increases by 37%. Oh, and, of course, the method provides an excellent aesthetic result: with a laser can whiten the entire smile in one session (within 1 hour). Depending on the mode laser can lighten the enamel just a few shades. The effect of bleaching will last up to 7 years (of course, if you do not abuse the coffee and cigarettes). Unlike the chemical method of laser whitening is allowed to do on the teeth, devoid of nerves, which, as you know, over time, change their color into darker. In this case, the inner tooth: the gel is put in the cavity and light shines on him from within. Ultrasound bleaching. The most gentle method. Suitable for people with very sensitive tooth enamel. This method uses a bleaching product from a much lower concentration of active substances (5-15% instead of 35-40%), and time effects of peroxide on the teeth is minimal - only 12 to 40 minutes. Heating and injury of dental tissue during the session does not happen, so either before, during, or after the procedure uncomfortable patient is experiencing. This method can be used in combination with laser bleaching. And with laser, and ultrasonic methods for tooth whitening from within, so the result if proper care is for life. Hollywood smile! Call the method of installation "Hollywood veneers - the thinnest (the width of 0, 2 mm) ceramic facing plates - one of the methods of tooth whitening, it would be incorrect. And still resort to this method makes sense if you want to bleach just one or a few teeth. As you know, teeth may darken from a poor sealing, after injury or as a result depulpirovaniya. In addition, it is worth remembering that bleach can only living tissue of the tooth, and seals do not change color. In that case, if the mouth is worth more sealed teeth, after whitening can close their brand-new Hollywood veneers and smile will be perfectly uniform in color. Unlike traditional veneers, Hollywood veneers are glued directly on the living enamel, whereas for the production of standard veneers have to grind your teeth, taking with them to 0, 5 mm of the upper layer. In addition, Hollywood veneers are manufactured using a unique technology of ultra-strong porcelain, the hardness of which efforts of the special crystals. "The second enamel bonded with a particularly strong and insoluble in the saliva of cement, which provides for additional bonding of the tooth and veneer. Unique cement contains a record number of fluorine. Therefore, during the whole time, until the teeth pokrytygollivudskimi veneers, their enamel not only does not suffer, but also strengthened. With these designs can not only correct the color of teeth, but also change their form (for example, to make them larger or elongated). Warning - fraud! Sometimes one of the types of whitening Dumb clinics issuing procedure professional cleanings. In fact, such a cleaning is mainly hygienic, rather than cosmetic purposes. With the help of the dentist to prevent the patient's risk of developing gingivitis and periodontitis. However, by cleaning the teeth from the dark plaque and tartar with this method can whiten a smile on 1-2 pitch. This procedure can be performed both mechanically and ultrasonically, apparently, is why and there is confusion.