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
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