Black Triangles

Black triangles are one of the risks of teeth straightening, especially in cases with large amounts of crowding.

If you imagine a patient with crowding has lived years with the gums wrapped around the tightly compacted teeth, and once the teeth are now aligned, the gum has a new shape of teeth it is wrapped around.

Why do they form?

  • The shape of the teeth – if the teeth are round and curvey, when aligned, they have a small area at the lower area near the neck of the teeth
  • Previous gum disease that has damaged the gum and tissues
  • Gum type, thin gum that is less thick is less likely to bounce up and cover


As you can see here, as the teeth are now aligned, and easier to clean, sometimes there is also a risk of black triangles forming – which is shown above by small gaps between the teeth at the gum level. This is not always 100% accurate, and the computer is highlighting high-risk areas, which in reality may not form as per the preview.

How to fix black triangles?

Fixing black triangles can be easily fixed using composite bonding. Black triangles can be closed with no drilling or injections, and the procedure can be done within one sitting. The whole procedure is reversible and can match again the rest of the teeth.

Our dentists in house can offer closing black triangles at the end of treatment, which is painless and a quick procedure. 

composite bonding black triangles

An example of composite bonding to close a difficult space, which has been done using bonding alone, with no drilling or injections by one of our dentists Dr. Aulak. A black triangle would not have this much space to close.

Dr. Deepak Aulak

Dr. Deepak Aulak

Dr. Deepak Aulak is a London-based dental practitioner with a special interest in cosmetic dentistry. Having graduated from King's College London in Dentistry, Dr. Aulak was decorated with over a dozen awards and scholarships along the way, which notably include the Jelf Medal, Malleson Prize for research and GKT Hospital's Full Shields.

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