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People with such conditions are rare so it can be assumed that over 90% of people can undergo and benefit from teeth whitening.
Can all teeth be whitened?
When the inner structure of the tooth becomes darker or yellowed, the stain is more difficult to remove or, depending on it's cause, may not be able to be removed at all. For example, tetracycline (an antibiotic) causes intrinsic (meaning that it affects the inner structure of the tooth) staining, when used by children under age 8 or women in the last half of their pregnancy. These stains cannot be removed by bleaching.
Fluorosis, a cosmetic dental condition that results from overexposure to fluoride during tooth development, also is not always successfully removed by bleaching. Mild to moderate fluorosis, characterized by white lines, streaks or spots, can be made less obvious by using whitening products or methods. However, in more severe cases of fluorosis, bleaching will not work.
A third type of stain is called "age-related." It's a combination of intrinsic and extrinsic factors. As we age, the dentin (the inner portion of the tooth) gets slightly yellow. This can become visible through the outer enamel as it gradually becomes thinner over time. Yellow stains are the easist to remove with bleaching. Gray or black stains tend to be more difficult. Generally, stains that have just formed are easier than stains that have been on your teeth a while.
It is not possible to turn teeth whiter than their original natural white. In some cases, even normal teeth will achieve only minor whitening improvement no matter what product you use because they just don't react to the peroxide gel.
Artificial dental work such as crowns, bonding, caps, veneers, bridges, or composite fillings will also NOT respond to bleaching. Teeth Whitening gel will only whiten natural teeth. Artificial teeth will not be whitened yet they will not be damaged by the peroxide. Customers with artificial teeth wishing to whiten their natural teeth can use our products.
In general, results will vary from customer to customer depending on the types of stains present.
How long do results last?
In theory results can last up to 2 years, but in practice they last less. Depending on a person's consumption of coffee, tea, red wine, colas and other darkening agents such as tobacco, most people could probably use another whitening session 6 months later. It also depends on the quality of the enamel. If someone has non-porous enamel, results will last longer. Those who have porous enamel will be more vulnerable to staining beverages and food. These 2 factors will determine how long results will last.
Generally one can say between 6 months (if the customer has porous enamel, drinks staining beverages and/or smokes) and 2 years (if the customer has non-porous enamel and habits that do not include staining beverages and/or smoking).
What is the difference between the hydrogen and carbamide peroxide gel?
Which is the better choice?
This is a 3 to 1 relationship between carbamide and hydrogen. This means that 12% hydrogen peroxide is equivalent (in theory) to around 36% carbamide peroxide. Some people prefer carbamide because it is softer on the gums. However, in practice we have found that hydrogen peroxide works much better than carbamide.
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