See your dentist: It is hard to say the cause without seeing it. Options may include decay, internal resorption, or extrinsic staining. A dentist would know and could best provide options for care.
Answered 1/26/2013
5.3k views
Nerve damage: Could be nerve damage to the tooth. Could be a cavity. See your dentist right away.
Answered 2/24/2013
5.3k views
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