Noticed small dark triangles between your front teeth after straightening? Here's why they happen and what can be done.
'Black triangles' are small dark spaces near the gumline between teeth. They're most common when crowded, overlapping teeth — especially triangular-shaped ones — are straightened, and in adults whose gums have receded slightly.
Why They Appear
How We Reduce Them During Treatment
IPR reshapes the sides of triangular teeth so they touch over a longer area, moving the contact point toward the gum. This is planned in ClinCheck before treatment starts.
| Fix | How it works | When used |
|---|---|---|
| IPR during Invisalign | Flattens contacts so teeth meet lower | Prevention, planned in advance |
| Composite bonding | Adds tooth-coloured material to fill the space | Small triangles after treatment |
| Veneers | Reshape teeth fully | Combined shape and colour concerns |
| Gum procedures | Encourage gum fill | Selected cases |
Frequently Asked Questions
Are black triangles caused by Invisalign?+
Aligners reveal rather than create them — the space was hidden behind overlapping teeth. Planning with IPR reduces the risk.
Do black triangles go away on their own?+
Gums sometimes fill in slightly over months, but significant triangles usually need bonding or reshaping.
Can braces also cause black triangles?+
Yes — it's related to tooth shape and gums, not the brand of treatment.
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