Black Triangles Between Teeth: Why They Show Up After Orthodontics or Gum Treatment

Black triangles, more formally called open gingival embrasures, are small, triangular dark gaps that appear at the gumline between adjacent teeth, where the gum tissue doesn't fully fill the space below the point where the teeth touch.

As teeth move into better alignment through orthodontic treatment, they sometimes end up more slender or upright at the gumline than they were in their original, more crowded position, meaning even though the teeth themselves are now straighter, the gum tissue and the natural triangular space beneath the contact point can become more visible than before.

No, this is also commonly associated with gum recession, whether from gum disease, aggressive brushing, or natural aging changes, since receding gum tissue similarly exposes more of this triangular space beneath the contact point between teeth.

Not necessarily a disease process in themselves, though they can be associated with underlying gum recession, which itself may have various causes worth understanding, meaning it's worth having your dentist evaluate whether an underlying gum health issue is relevant to your specific situation.

Your orthodontist can sometimes anticipate and plan for this possibility, and in some cases, minor adjustments to tooth positioning or timing of certain interventions can help minimize this effect, though it's not always fully avoidable given individual gum and tooth anatomy.

Options range from a non-invasive approach, such as dental bonding to add material to the sides of the affected teeth and reduce the visible gap, to more involved options like veneers for a more comprehensive cosmetic result, to gum-focused treatments like hyaluronic acid gel injections that some providers use to help encourage gum tissue to fill the space, depending on your specific situation and preferences.

Bonding provides a durable, though not permanent, solution, similar to how bonding is used for other cosmetic purposes, generally needing occasional touch-up or eventual replacement over the years, similar to bonding used elsewhere.

For cases specifically related to gum recession, gum grafting can sometimes help address the underlying recession, though this is a more involved procedure typically reserved for more significant recession concerns rather than purely cosmetic black triangle correction alone.

Yes, if you have any pre-existing gum recession or particularly triangular-shaped teeth, raising this specific concern proactively with your orthodontist allows for realistic expectation-setting and any reasonable planning adjustments before treatment begins.

This varies by the underlying cause — if related to ongoing gum recession, the appearance could potentially become more pronounced over time as recession continues, while triangles related purely to orthodontic tooth shape and position without ongoing recession may remain relatively stable.