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Sounds like black line stain - it is a pellicle stain caused by gram-positive bacteria on your teeth. It is common in women and children. A dental hygenist can help remove it, but sadly it is quite tenacious and will grow back rapidly. * Tobacco stains. * Coffee stains. * Tea Stains. * Stains to some kind of spices.

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Q: What can cause a black line to form on back of teeth not on the gum line?
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