14+ Light Brown Stain On Tooth. The dark brown/black stains you see are extrinsic (meaning on the outside) stains. What causes brown stains on teeth?
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Spots of brown discoloration on the teeth are very common. The main cause of brown spots is smoking. Not fun to put togetherkiarakenii bought this product in store. Brown spots on teeth can be an early warning sign of cavities, which require a dentist to fix.