Generally, bleaching is successful in at least 90% of patients, though it may not be an option for everyone.
Consider tooth bleaching if your teeth are darkened from age, coffee, tea, red wine or smoking. Teeth darkened with shades of yellow, brown or orange respond better to lightening. Gray stains caused by fluorosis, smoking or tetracycline can be lightened, but the results are not as dramatic. If you have sensitive teeth, gum disease, or teeth with worn enamel, your dentist may discourage bleaching.
How long does it last?
Bleaching should last 1 to 5 years, depending on your personal habits such as smoking and drinking coffee and tea.
At some point you may want a touch-up.
How does it work?
The active ingredient in most of the whitening agents is 10% carbamide peroxide.
When water comes in contact with it, the release of hydrogen peroxide lightens the teeth.
Is it safe? Are there any side effects?
Studies have proven bleaching to be safe and effective.
Some patients may experience slight gum irritation or tooth sensitivity, which ends when the treatment does.
What are the realistic expectations?
Typically, there is a two-shade improvement as seen on a dentist's shade guide. The success rate depends on the type of stain involved and your compliance. Bleaching can only provide a shift in color from gray to a lighter shade of gray. Bleaching does not lighten artificial materials such as resins, silicates or porcelains.
Reprinted with permission from the Academy of General Dentistry
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Microwaves and 'Erupted Hot Water Phenomena'
Hot-water eruption can occur if you use a microwave oven to super-heat water in a clean cup. ("Super-heated" means the water is hot beyond boiling temperature, although it shows no signs of boiling.)
A slight disturbance or movement may cause the water to violently explode out of the cup. There have been reports of serious skin burns or scalding injuries around people's hands and faces as a result of this phenomenon.
Adding materials such as instant coffee or sugar to the water before heating greatly reduces the risk of hot-water eruption. Also, follow the precautions and recommendations found in microwave oven instruction manuals; specifically the heating time.
