Many things: Just stain, tooth decay, re-calcified old decay etc, etc try to see a dentist and they will tell you after they examine.
Answered 1/27/2014
5.4k views
Possibly a cavity: This brown spot could be a cavity forming on your tooth, or it could be a spot of stain. If it is a cavity, it should be treated as soon as possible as it is undermining the enamel of your tooth. If it is just stain, getting a cleaning will remove it. The best course of action is to see your dentist as soon as possible so that it can be determined what the brown spot is.
Answered 6/19/2017
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