The first step in deciding whether or not to whiten teeth should always be a proper dental examination with x-ray pictures to determine the cause of the tooth discoloration. This is the best context in which to explore whitening options, with the person who is in the best position to advise you: your dentist.
The optimal, most natural-looking tooth shade is always the one that creates a match between the whiteness of the teeth and the whites of a person's eyes. The pre-bleaching exam may reveal a need for a particular treatment, before or even instead of bleaching.
For example, there are several causes for discoloration abscessed teeth, decay, and root canal problems, to name a few for which bleaching will mask but not resolve the problem.
There are also some aesthetic considerations, such as how much of your teeth and gums show when you smile.
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