Black Triangles Between Teeth: Causes and How to Fix Them
Honest answers about why dark gaps form at the gumline and the treatments that actually close them.
Black triangles between teeth are the small dark gaps that appear at the gumline where two teeth meet. Dentists call them open gingival embrasures, and they are one of the most common aesthetic complaints we see at EsteGo Clinic in Istanbul.
They are almost always harmless to your dental health, but they can trap food, feel hard to clean and make a smile look older than it really is. The reassuring news is that in most cases they can be improved or fully closed once the underlying cause is identified.
What are black triangles between teeth?
A black triangle is a triangular gap at the gumline, framed by the curved sides of two neighbouring teeth and the gum tissue below. Normally a small pyramid of gum (the interdental papilla) fills this space. When that papilla shrinks or no longer reaches the point where the teeth touch, an open space is left behind, and light passing through it makes the gap look dark.
These gaps are graded by how much papilla has been lost. Mild cases show only a tiny notch near the gumline, while advanced cases leave a wide, obvious space that catches food. Knowing the grade helps your dentist pick the least invasive fix that will still hold up over time.
What causes black triangles between teeth?
Black triangles between teeth almost always come down to lost gum or bone volume. The single most common cause is gum recession, where the gumline pulls back and exposes more of the tooth than before.
Other causes include bone loss from gum disease (periodontitis), which destroys the support that holds the papilla up; naturally triangular-shaped tooth crowns that only meet at their tips; aggressive brushing or snapping floss that injures the delicate papilla; the normal thinning of gum tissue with aging; and sometimes the aftermath of orthodontic treatment, when teeth are moved close together but the papilla does not fill back in.
If gum disease is still active, treating the infection has to come first, because no cosmetic repair will last on an unstable foundation. You can read more about the early warning signs on our receding gums page.
How to fix black triangles between teeth
There is no single best answer — the right fix depends on the cause and on how large the gap is. Below are the main options, ranked roughly from the fastest and least invasive to the most involved.
Composite bonding is usually the first choice. Tooth-coloured resin is added to the sides of the teeth to rebuild the contact point and gently close the gap, often in a single visit and without any drilling. See how it works on our dental bonding page.
Porcelain veneers reshape the teeth for a more even, symmetrical result and are ideal when the tooth shape itself is the problem, or when you also want to change colour and alignment. You can compare veneers in Turkey with lower-cost composite veneers.
Gum treatment is essential when periodontitis is the driver; cleaning and stabilising the gums protects any aesthetic work that follows. Orthodontics can move teeth closer together to shrink the space, and in carefully selected cases hyaluronic-acid papilla regeneration — a gel injected into the papilla — can partially rebuild lost tissue, though the results are modest and not permanent.
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Bonding vs veneers vs gum treatment: which lasts?
Composite bonding is fast, affordable and reversible, but the resin can stain over time and may need a polish or a small top-up after a few years. Porcelain veneers cost more and involve minimal tooth preparation, yet they resist staining and typically last ten to fifteen years with good care. Gum treatment does not close the gap by itself — instead it makes the mouth healthy enough for bonding or veneers to succeed.
For a full makeover that balances shape, colour and symmetry across the smile, many patients choose a planned smile design in Turkey, where every tooth is mapped digitally before any treatment begins.
Whatever the method, closing black triangles between teeth is as much about the contact point and the health of the gums as it is about the visible surface — which is exactly why a proper in-person or photo assessment matters so much.
Cost of treating black triangles: Turkey vs UK and US
Prices vary a lot by method and by country. In the UK, composite bonding runs around £150–£300 per tooth and porcelain veneers £500–£1,000 each; in the US, veneers commonly cost $900–$2,500 per tooth. In Turkey, the same work is typically a fraction of that — often €120–€250 for bonding and €200–€350 for a porcelain veneer per tooth — because clinic and laboratory costs are lower, not because the quality is.
For balanced, non-commercial background on gum health and cosmetic options, the American Dental Association patient resources are a reliable place to start before you commit to anything.
At EsteGo Clinic we never recommend treatment before we actually see your teeth. After a free assessment we tell you honestly whether simple bonding will do, whether veneers make more sense, or whether gum treatment has to come first.
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