Noticed small dark gaps near the base of your front teeth that weren't there before? You're not imagining it, and you're not alone. Black triangles between teeth are one of those things patients at Hocking Dental Care ask about quite often, usually after spotting them in a photo rather than in the mirror. They're rarely urgent, but they're worth understanding properly.
In this post we'll explain what causes these gaps, why they sometimes show up after braces or a clean, and what can realistically be done about them. We won't promise they'll disappear completely, because that depends on your own teeth and gums. What we can promise is an honest look and a clear explanation of your options.
What exactly is a black triangle between teeth?
The small triangle of gum tissue that normally sits between two teeth near the gumline is called the papilla. Black triangles are small, dark-looking spaces between teeth near the gumline that appear when the gum tissue between two teeth does not fill the space below their contact point. When that tissue shrinks back or was never quite tall enough, the dark space behind your teeth becomes visible.
It's not actually a hole in the tooth. It's an open gap where gum tissue used to be, or where it never fully filled in. That's an important difference, because a dark mark on the tooth itself could be something else entirely, like staining or early decay, and that's worth having checked separately at a regular check-up and clean.
Why do black triangles between teeth appear?
There's rarely just one cause. A few things tend to work together.
Gum recession
Gum recession is one of the most common causes, where gum tissue pulls away from the tooth surface and the papilla loses height along with it, often developing from gum disease, aggressive brushing, or the gradual thinning that comes with age. Once that tissue has receded, it doesn't tend to grow back on its own.
Tooth shape
Some teeth are naturally more rectangular, staying a similar width from the gumline up to the biting edge. Others are more triangular, narrower down near the gum and wider up top. Teeth come in different shapes and sizes, and rectangular teeth are equally wide at the top and bottom, while you may develop black gaps between your teeth if your incisors are narrower at the gumline than they are at the biting surface. That's mostly down to genetics, not anything you've done.
Brushing and flossing technique
Flossing too hard can hurt your gums instead of helping them, so it's worth flossing carefully and avoiding pressure on your gums so they don't get irritated and start to recede. A firm-bristle toothbrush used with heavy pressure can have a similar effect over time. Interdental brushes that are too large for the gap can also wear away the tissue.
Bone levels underneath the gum
Gums will start to recede if the bone underneath them starts to disappear, and that bone loss can be caused by problems like osteoporosis and severe gum disease. This is one of the reasons we don't just look at the gum line in isolation during a check-up.
Black triangles between teeth after braces or aligners
This one catches a lot of people off guard. You finish straightening your teeth expecting a neater smile, and then notice small gaps near the gum that weren't there before.
The belief that black triangles are caused by orthodontic treatment is largely a misconception, because orthodontic treatment doesn't cause black triangles, it simply exposes them, and when your teeth are aligned, receding gums or a lack of gum tissue between the teeth becomes visible. In other words, when teeth were crowded or overlapping, the gap was hidden. Once everything is straightened and the teeth are sitting where they should, the true shape of the gum line shows through.
At Hocking Dental Care we don't provide orthodontic treatment with braces or clear aligners ourselves for closing these gaps, but we can talk through cosmetic options once your teeth have settled into their new position, and refer you to an orthodontist if further tooth movement looks like the better path.
Black triangles between teeth after a clean
It's also common to notice these gaps straight after a professional clean, and it can feel like the appointment caused them. Usually what's happened is the opposite. Built-up plaque and tartar around the gum line were sitting in that space and puffing the gum tissue out slightly.
Once that build-up is removed, any gum tissue that had already receded underneath becomes visible again. The clean didn't create the gap, it just removed what was disguising it. This is exactly why regular check-ups and cleans matter, because they let us track whether gum tissue is genuinely receding over time, rather than finding out suddenly.
Black triangles between teeth treatment and how to fix them
There's no single fix that suits everyone, because the right approach depends on what's causing the gap in your case and how it looks to you. Here's what we can realistically talk through.
Looking after your gums first
If there's any sign of gum inflammation or disease, that gets addressed before anything cosmetic is considered. Healthier gums won't necessarily fill in an established gap, but treating the gums helps stop things getting worse, and it's the responsible first step.
Cosmetic bonding or veneers
For many patients, reshaping the edge of the tooth with tooth-coloured material or a veneer can reduce how visible the gap looks, by gently extending the side of the tooth down toward the gum line. This is something we discuss as part of cosmetic dentistry at Hocking Dental Care, after a proper look at your teeth and gums together. Results vary from person to person, and we'll always explain what's realistic for your particular teeth before recommending anything.
Orthodontic movement
If the gap is mainly about where your teeth sit rather than the gum tissue itself, moving the teeth slightly closer together with clear aligners or braces can sometimes help. This is provided by a registered orthodontist, and we're happy to discuss whether a referral makes sense for you.
Specialist gum treatment
For more significant gum recession, some patients are referred to an oral surgeon or periodontist for tissue procedures. We don't perform these at Hocking Dental Care, but we can explain what's involved in general terms and help you understand whether it's worth exploring.
Should you be worried about black triangles between teeth?
Most of the time, no. For plenty of people, black triangles are simply down to tooth shape or gentle, age-related gum changes, and don't point to anything serious. The main thing worth watching is whether a gap is new, growing, or showing up alongside bleeding, tenderness or teeth that feel slightly loose. Any of those are worth mentioning at your next visit.
During your check-up, we use an intraoral camera to put a picture of the area up on the screen beside the chair, so you can see exactly what we're looking at rather than just taking our word for it. If treatment is ever recommended, you'll get a written estimate with item numbers before anything starts, so you can check it against your health fund if needed. We're a preferred provider for HBF, Medibank, HCF, nib and Bupa, which usually means a smaller gap for you, though it's never free, and other funds can still claim through HICAPS on the day.
Frequently asked questions
Can black triangles between teeth go away on their own?
Generally not. Once the gum tissue in that space has receded, it doesn't tend to grow back by itself. Improving your brushing and flossing technique can help stop things getting worse, but it won't usually rebuild tissue that's already gone.
Are black triangles a sign of gum disease?
Not always. They can simply be down to tooth shape or gradual age-related changes. That said, new or widening gaps, especially alongside bleeding or tenderness, are worth having checked at a check-up so any gum issue can be picked up early.
Will fillings or bonding close the gap completely?
Cosmetic bonding can reduce how visible the gap looks by reshaping the edge of the tooth, but it won't necessarily close it entirely, and results vary from person to person. We'll talk through what's realistic for your teeth during an assessment.
Can I prevent black triangles from forming?
Gentle brushing with a soft brush, careful flossing technique and regular professional cleans all help protect the gum tissue you have. They won't change your natural tooth shape, but they reduce the risk of gum-related recession adding to the problem.
Should I see a dentist about a new gap between my teeth?
Yes, it's worth getting any new or changing gap looked at. A dentist can tell the difference between a cosmetic issue and something that needs gum treatment, and can rule out other causes of dark areas near the teeth.
If you've noticed black triangles between your teeth and want an honest opinion on what's causing them, our team at Hocking Dental Care is happy to take a look. We'll explain what we see on the screen, talk through options without any pressure, and give you everything in writing before you decide anything. You can find out more about visiting us as a new patient, choose a time online, or call us on (08) 9306 2755 to book a check-up at our Hocking practice.
