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25Dec/110

Tooth bleaching

Dental bleaching, also known as tooth whitening, is a common procedure in general dentistry but most especially in the field of cosmetic dentistry. A child's deciduous teeth are generally whiter than the adult teeth that follow. As a person ages the adult teeth often become darker due to changes in the mineral structure of the tooth, as the enamel becomes less porous.[citation needed] Teeth can also become stained by bacterial pigments, foodstuffs and tobacco. Certain antibiotic medications (like tetracycline) can also cause teeth stains or a reduction in the brilliance of the enamel.[1]

According to the FDA, whitening restores natural tooth color and bleaching whitens beyond the natural color. There are many methods to whiten teeth, such as brushing, bleaching strips, bleaching pen, bleaching gel, laser bleaching, and natural bleaching. Traditionally, at-home whiteners use overnight trays containing a carbamide peroxide gel which reacts with water to form hydrogen peroxide. Carbamide peroxide has about a third of the strength of hydrogen peroxide. This means that a 15 percent solution of carbamide peroxide is the rough equivalent of a five percent solution of hydrogen peroxide. Over the counter kits whiten with small strips that go over the front teeth. The peroxide oxidizing agent penetrates the porosities in the rod-like crystal structure of enamel and bleaches stain deposits in the dentin. Power bleaching uses light energy to accelerate the process of bleaching in a dental office. The effects of bleaching can last for several months, but may vary depending on the lifestyle of the patient. Factors that decrease whitening include smoking and the ingestion of dark colored liquids like coffee, tea and red wine. Dentures can also be whitened using denture cleaners.

Internal staining of dentin can discolor the teeth from inside out. Internal bleaching can remedy this. If heavy staining or tetracycline damage is present on a patient's teeth, and whitening is ineffective, there are other methods of whitening teeth. Bonding, when a thin coating of composite material is applied to the front of a person's teeth and then cured with a blue light can be performed to mask the staining. A veneer can also mask tooth discoloration.

 


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25Dec/110

Teeth Bleaching

Teeth is an important part of the human body. It is vital a part of our appearance and digestive system. The teeth is made up of dentine over which a layer of enamel a hard glossy substance protects the teeth.

The teeth over a period of time loose its sheen owing to many reasons such as lack of brushing, lack of hygiene, smoking and whole other features. Sometimes intake of antibiotics can also cause discoloration of the teeth. This discoloration of teeth results in the loss of the whiteness of the teeth over a period of time. This also leads to cavity formation.

Teeth BleachingSome times the discoloration of the the may be not form outside but from inside where the dentine gets discolored and this would require more than bleaching. The best way to remove discoloration is bleaching using peroxide solution where the dirt is removed while bleaching. For this solutions of hydrogen peroxide and carbamide peroxide are used.

carbamide peroxide breaks down releasing hydrogen peroxide an oxidizing agent thereby bleaching the dirt in the process. Concentration of hydrogen peroxide is recommended at .1% beyond which damage to teeth can occur. Solutions above this concentration can only be used under the supervision of a qualified dentist. Over bleaching can cause destruction to the enamel layer and further affecting the dentine layer.

Sometimes the discoloration is from within inside affecting the dentine and not the enamel in this case bleaching will not get back the shine veneers a cap or crown will have to be used to mask the discoloration. Bleaching can also be carried out using laser for which a paste containing hydrogen peroxide is applied and laser is shined on the specific part.

This procedure is accurate and the patient gets the benefit in one sitting compared to the normal method where the patient would have to sit for two or more sitting. Ultra  violet light is also used where a paste is applied and on shining ultra violet light high concentration of hydrogen peroxide is released cleaning the area. Most of the procedure can be done at home itself.

Regular mouth washes do contain bleaching agents which can be used periodically.  Only heavy stains and discoloration would require an expert dentist to bleach the area. Regular bleaching is also not advised owing to the damage it can cause. Prevention is the best method and adhering to proper oral hygiene is best advised.


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