hi, please see your dentist right away. For teeth to stain that quickly this is very abnormal. Teeth will stain over a period of time with teas, cigarette smoking and alcohol, but there is rare fungus that can cause this. There is also a bacteria under the gums that appears greenish at first and then can turn dark. Usually this can cause very serious decay. If you have any other questions, please ask. In the mean time floss and use a stain/whitening toothpaste and warm salt water rinses. If you take your fingernail and can scrap it off, you need to see a dentist ASAP.
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