It looks like a stain. To confirm it is not a cavity (penetrated internally), x-rays and clinical exam must be done. It does not appear urgent so hopefully you can get it checked on you next annual/biannual exam.
It looks like a stain. To confirm it is not a cavity (penetrated internally), x-rays and clinical exam must be done. It does not appear urgent so hopefully you can get it checked on you next annual/biannual exam.
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