Quick answer
Black triangles between teeth after dental cleaning are dark spaces where the pink gum between two teeth no longer fills the area. A routine cleaning may uncover a gap that hardened tartar had hidden. After a deep cleaning, swollen gums can tighten as inflammation settles, making earlier tissue or bone loss more visible. The contour may change during healing, but established loss of this gum tissue usually does not grow back.
What a black triangle actually is
A black triangle is not a new stain or a hole in your tooth. Dentists call it an open gingival embrasure. It appears when the interdental papilla, the small peak of gum between neighbouring teeth, does not fill the space below their contact point.
The darkness is usually a shadow from the open space. Whitening toothpaste will not remove it. Scraping the area yourself will not rebuild gum and could injure the tissue.
Sharma and Park's review found several factors behind these gaps. They include periodontal disease, bone height, tooth shape, root angle, and the position where two teeth touch. A close-up photo cannot identify which factor applies to you.
Why the gap appeared after cleaning
The timing matters. So does the kind of cleaning you received.
It appeared immediately after a routine cleaning
Plaque can harden into tartar between teeth. A professional scale removes that deposit. If tartar occupied an existing space, its removal can make the true gap visible for the first time.
This does not mean tartar was safely supporting the gum. The American Dental Association explains that plaque and tartar below the gumline drive inflammation and periodontal pockets. Leaving deposits in place risks more damage.
It developed after a deep cleaning
Scaling and root planing cleans below the gumline to treat periodontal disease. Inflamed gums can look fuller before treatment. As the tissue heals and deep pockets reduce, more root surface or space may show.
The British Society of Periodontology lists recession, longer-looking teeth, and black triangles as possible results of this healing.
Guy's and St Thomas' NHS Foundation Trust says the amount of shrinkage depends on earlier bone loss and gum swelling. In this setting, the cleaning may reveal prior disease damage rather than create a healthy piece of missing gum.
Will the gum fill the triangle again?
There is no reliable countdown for a black triangle to close. The surrounding contour can still change while short-term tenderness and swelling settle. Judge it at the follow-up your dental team planned, not from a first-day mirror check.
If a removed deposit had hidden the space, the deposit should not be allowed to return. If the papilla has been lost through recession or reduced bone support, natural refill is unlikely. The British Society of Periodontology describes established papilla loss after periodontal treatment as irreversible, although its appearance can sometimes be masked.
That trade-off can feel frustrating. Healthier, less inflamed gums may look less full, yet controlling the disease helps protect the teeth that remain.
What to do now
- Follow the aftercare given by your dentist or hygienist.
- Brush twice daily with a soft brush. Clean between your teeth every day.
- Ask which floss or interdental-brush size fits this space. Do not force an oversized brush through it.
- Keep the planned reassessment so the team can recheck gum pockets and healing.
- Take one clear photo in consistent light and at a fixed distance. Daily close-ups can make small changes hard to judge.
Do not pack the gap with wax, glue, or another DIY filler. Do not stop cleaning it in the hope that tartar will hide it again.
The American Dental Association's guidance on interdental cleaning supports floss for tight contacts and small brushes for more open spaces. Your dental team can choose the safer size and show you the angle.
How your dentist works out the cause
Your dentist can compare the new gap with earlier photographs or X-rays, if available. They can measure gum pockets, check for bleeding, and assess recession, bone support, tooth shape, and contact position.
Ask these four questions:
- Was this a routine cleaning or scaling and root planing?
- Did my earlier chart or X-ray show bone or gum loss here?
- When should we reassess the final gum contour?
- Which tool and size should I use between these teeth?
If your gums are still inflamed, stabilising them comes before cosmetic work. Otherwise, a quick appearance fix can hide a space without addressing its cause.
Options if the gap remains
A small, cleanable triangle may need no treatment. If it traps food or bothers you, the right option depends on the teeth, gums, bone, and bite.
Composite bonding can change the tooth outline and make the space less visible. Selected orthodontic movement can alter root position or the contact between teeth. Periodontal procedures aim to rebuild or add soft tissue in certain cases.
None offers guaranteed gum regrowth. A 2024 systematic review included 45 reconstruction studies, but their methods and results differed too much for a meta-analysis. The authors found too little evidence to recommend one approach to clinicians.
Have gum health assessed first. Then ask a dentist, orthodontist, or periodontist what can change in your specific anatomy and what maintenance it needs.
When to contact the clinic sooner
A stable, painless triangle is usually suitable for a normal review. Contact the clinic sooner if you have worsening pain, swelling, heavy bleeding, pus, or a newly loose tooth.
Also call if you can see a fresh wound or believe the gum was injured. An in-person examination and your periodontal records are more useful than a selfie for settling that concern.
FAQ
Did the hygienist remove my gum?
A routine cleaning is designed to remove plaque and tartar, not healthy gum. An immediate gap may have been uncovered by deposit removal. After deep scaling, reduced swelling can expose earlier tissue or bone loss. Ask for an examination if there is a visible wound or ongoing pain.
Will black triangles fill in after dental cleaning?
The gum contour may change as early swelling settles. Established recession or papilla loss does not predictably refill by itself. Your dental team's planned reassessment is the best time to judge what remains.
Can bonding close a black triangle?
Composite bonding can reshape selected teeth and mask some of the space. It does not regrow gum or treat periodontal disease. A dentist must first check the bite, tooth shape, and gum stability.
Should I stop flossing the gap?
No. Plaque control supports gum health after cleaning. Ask your dental team whether floss or a correctly sized interdental brush suits the space, and use it gently.
