If someone is not pleased with the color of his teeth, today very efficacious methods exist to clear up them. 
We must understand first which have been the origins of the pigmentation.
They can be various:
Intrinsic: from Thetracyclines (antibiotic) taken in childhood, fluorosis etc.
Extrinsic: from sigarette smoke, caffeine, teine, other alimentary substances, aging.
The bleaching modalities could be different depending on the cause, but the modern methods avail all themselves of oxidative substances (Hidrogen peroxide or Carbammide peroxide) with different concentrations. 

The bleaching can be either performed on the devitalized tooth (where the change of the color is very common) or on the vital tooth (bleaching vital). 

On the devitalized tooth the bleaching agent is applied inside the tooth, after an adeguate preparation; on the vital teeth it is applied over the external surface of them. 

Essentially there are two kinds of application: “office bleaching” and “home bleaching”. 

The “office” modality, which is faster, avails itself of higher concentration products, so must be performed under strict control of the dentist, who isolates the teeth, protecting gingives from the irritating action of the bleaching gel. 

One or two sessions are enough for each arch, about half an hour long each, and the treatment is over. 

The “home” modality avails itself of lower concentration products, requiring more time to operate that are little irritant for the gengiva. 

A plastic mask is built, soft and trasparent, to measure for each patient, thanks to impressions of the dental arches, and is delivered to the patient with a bleaching gel packing.
He will wear it in the evening, before going to sleep, after tooh brushing and after filling it with the gel. 

The ”home” treatment usually lasts one week and the outcomes are already evident. 

Retaining the mask, the treatment can be reinforced after one year or more, if necessary. 

When the treatment is completed and the desired outcome is reached, the old fillings can be renewned, as they appear darker now, compared with the new color of the teeth. 

A temporary hiper-sensitivity of the teeth could happen after the treatment, but this can be easily cleared up, applying specific desensiting products.
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