There are many reasons why teeth can become discolored. The major reasons are: Diet - Drinking tea, coffee, red wine or other food and drink with strong colorings. Smoking - Smoking can result in teeth appearing a yellowish color. Age - As people grow older their teeth can become darker naturally. Tooth decay, fillings [...]
NO! There is no whitening solution for most dental work such as fillings, crowns, veneers, or partial or full dentures. If the color of your teeth matches the color of your dental work before whitening, the color of your teeth will most likely be different from the color of your dental work after whitening. [...]
Some patients report a temporary increase in sensitivity. Tender gums are also a known side effect especially if you are whitening at home and use too much of the whitening solution. Remember that a little is good, and a lot will not make your teeth any whiter.
Since the results vary from patient to patient there is no firm answer. We do know that teeth tend to become darker as time passes, so touch-up treatments are occasionally needed to keep the teeth lightened. Your eating, drinking, smoking and home care habits definitely have an effect on how long the treatment lasts. [...]