Are black triangles after a deep cleaning permanent?
Cited to 4 sources. Reviewed 2026-08-25.
Usually yes, the gum tissue does not fill those gaps back in. Black triangles show up after a deep cleaning because hardened tartar and swollen gum tissue that filled the space between your teeth have been removed. Cleveland Clinic states that receding gums cannot grow back. Some of the gap can close slightly as swelling settles in the first weeks, but the underlying loss of gum height between the teeth is generally permanent. Cosmetic options exist through your dentist, including bonding and orthodontics.
- Why they appear
- Tartar and swollen gum removed
- Gum tissue regrowth
- Does not happen on its own
- Minor improvement window
- First few weeks as swelling settles
- Cosmetic options
- Bonding, orthodontics, grafting
What a black triangle actually is
The pointed piece of gum that sits between two teeth is the interdental papilla. When it is healthy and full it occupies the whole space under the point where the teeth touch. When it shrinks or is lost, that space shows through as a dark triangle.
Periodontitis destroys attachment and the bone underneath it. Cleveland Clinic describes periodontitis as damaging the bone that supports your teeth, and NIDCR describes gum disease spreading to the bones supporting the teeth when untreated. The papilla sits on that bone. When the bone level between two teeth drops, the papilla has nothing to hold it up, so it recedes and the triangle opens.
Why they appear right after the cleaning, not before
The loss was already there. Two things were hiding it. Hardened tartar physically filled the space between the teeth, and inflamed gum tissue was swollen enough to bulge into it. Scaling and root planing removes the first and resolves the second.
Cleveland Clinic does list gum recession that reveals tooth roots among the possible effects of a deep cleaning. The visible change is real, but it is the treatment revealing existing damage rather than creating it. That distinction matters when you are deciding whether to be angry at your hygienist or grateful they caught it.
| What changed | Reversible? |
|---|---|
| Tartar filling the space is gone | No, and you would not want it back |
| Gum swelling has resolved | Partly; a little bulk returns as tissue firms up |
| Papilla height lost to attachment loss | No, per Cleveland Clinic gums do not grow back |
| Bone level between the teeth | Not without surgical grafting or regeneration |
| Food trapping in the new space | Manageable with interdental cleaning |
What can be done about them
There is no toothpaste, rinse or massage that regrows an interdental papilla. Realistic options come from your dentist and depend on why the space is there. Cleveland Clinic describes dental bonding and orthodontics among the nonsurgical approaches to gum recession, and gum graft surgery as the most predictable and long lasting surgical treatment. Bonding adds tooth-coloured material to broaden the contact between teeth and shorten the triangle. Orthodontics can move roots closer together so the papilla has less space to fill.
Before pursuing any of it, get the periodontal disease itself stable. The Academy of Periodontology notes that many patients need no further treatment after scaling and root planing but that most need ongoing maintenance therapy to sustain periodontal health. Cosmetic work built on unstable gums does not last.
- Composite bonding to close the space from the tooth side
- Orthodontic movement to bring the roots and contact point closer
- Gum or bone grafting in selected cases, discussed with a periodontist
- Interdental brushes or a water flosser to keep the new spaces clean
- Doing nothing, which is a legitimate choice if the space is in a back tooth and stays clean
The practical problem is cleaning, not looks
Open spaces between teeth trap food and hold plaque, which is the same fuel that caused the attachment loss in the first place. Keeping them clean is the part that affects whether you lose more.
Regular floss often will not contact the tooth surfaces properly in a wide space. The ADA notes that beyond traditional floss you can use dental picks, tiny brushes or water flossers, and that cleaning between the teeth should not cause pain. Ask your hygienist to size an interdental brush for the specific spaces at your next visit rather than guessing.
Call your dentist or oral surgeon if
- Black triangles that keep getting larger over months, which suggests ongoing attachment loss
- Food packing into a space that then becomes sore, swollen or smells bad
- Gums that still bleed easily beyond about 3 to 4 weeks after treatment
- A tooth next to the space becoming looser over time
- Pus, severe swelling, or a bad taste that keeps returning
- Sharp pain when cleaning between two specific teeth
Related questions
Will the black triangles close up as my gums heal?
Expect only a small change. As swelling settles and the tissue firms up over the first weeks, some spaces look marginally better. The height lost to attachment loss does not come back, because Cleveland Clinic notes receding gums cannot grow back.
Did the hygienist cause this by cleaning too aggressively?
Almost always no. The tartar and swelling were hiding gum loss that had already happened. Removing them is the point of the procedure, and leaving tartar in place to hide the gaps would let the underlying disease keep destroying support.
Can a gum graft fix a black triangle?
Grafting is well established for covering exposed roots on the outside surface of a tooth, which Cleveland Clinic describes as the most predictable treatment for recession. Rebuilding papilla in the space between two teeth is a harder problem and results are less predictable, so discuss expectations with a periodontist before committing.
Sources
- Gum Recession: Causes, Prevention, Surgery and Treatment (Cleveland Clinic)
- Scaling and Root Planing: Why You Might Need a Deep Dental Cleaning (Cleveland Clinic)
- Non-Surgical Treatments (American Academy of Periodontology)
- Flossing (American Dental Association (MouthHealthy))
Reviewed against the sources above on 2026-08-25. General information only, not dental advice. Your own provider's aftercare instructions come first.
Keep reading
Gum tissue that has already receded does not grow back after a deep cleaning. Cleveland Clinic states plainly that receding gums cannot grow back and that gum recession cannot be cured. What a deep cleaning does achieve is reattachment: the ADA describes root planing as smoothing the tooth roots to help the gums reattach to the teeth, which tightens the tissue and shrinks the pockets. Height that was lost stays lost, but the disease process driving further loss can be stopped.
Teeth often feel looser right after a deep cleaning because hardened tartar that was wedged between and around them has been removed. That tartar was acting like a rough splint. Cleveland Clinic lists a loose teeth sensation among the possible effects of the procedure. For most people the feeling eases over the following weeks as inflamed gum tissue firms up around the roots. Looseness that gets worse over time, rather than better, reflects underlying bone loss and needs your dentist to assess it.
Keep brushing twice a day and cleaning between your teeth once a day, starting the same day, just more gently than usual. Use a soft-bristled brush angled at 45 degrees to the gumline with short, tooth-wide strokes, which is the ADA technique. Slide floss in rather than snapping it, then curve it into a C shape against each tooth. Sore gums make people skip cleaning for a week, and that is the most common reason a deep cleaning underperforms.
For most people, cold and touch sensitivity after a deep cleaning is worst in the first few days and largely gone within one to two weeks. The ADA says to expect tooth sensitivity for up to a week after scaling and root planing. Cleveland Clinic gives a longer outside range and says sensitivity should go away in a month or two. Sensitivity that is still severe after two months, or that gets worse instead of better, should be checked by your dentist.