Dark spots can be caused by many things, some of which include developmental enamel defects, deep grooves, stain, erosion of the enamel, a chip in the tooth, and decay.
Dr. Gray can take a close look at your tooth and determine what is causing the dark spot and discuss options for how to address it. By the time a cavity is visible as a dark spot on your tooth, it is already quite advanced, and has been growing for a long time (even though it may not hurt or cause sensitivity).
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Any time you are concerned about a dark spot, call and make an appointment for an evaluation. If we catch a cavity soon enough, we may be able to repair the tooth with a filling. If it continues to grow larger, a root canal treatment and crown may be needed to save the tooth. Bear in mind that there is always the possibility that our exam will reveal that the dark spot is not a cavity and you can stop worrying about the tooth!