Black line on tooth?
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It can only be a stain needing a dental cleaning. If the dentist suspects that it is a cavity, he or she can put a sealant or a small filling on it.
For sealants: http://www.studiodentaire.com/en/treatme...
For cleanings: http://www.studiodentaire.com/en/treatme...
It is the beginning of a cavity. You need to get it taken care of before it gets into the pulp where the bacteria can really start to grow. Plus it will get infected & the nerve in your tooth will start triggering pain.
Get it fixed now before you lose your tooth.
Sounds like a hair line fracture. Teeth can get fractured too. See a dentist because after awhile you WILL start having pain.
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