Black Triangles Between Teeth – Why They Happen & How to Fix Them
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If you’ve started noticing small black triangles between your teeth near the gum line, you’re certainly not the first. Unlike some other dental issues, they can appear gradually as your gum changes or overnight after orthodontic treatment. Either way, your smile might start to look “off”.
While it tends to affect people over the age of 20, it can happen to anyone, meaning that a lot of people live with the problem every day. Naturally, when you’re dealing with something like this, you want a way to fix it.
In this blog, we examine what causes them and what your dentist in Manchester can do about the issue. Spoiler alert: There’s a lot that can be done.
So, what do we mean when we say ‘black triangles between teeth’? Rather than describing decay or staining, we’re talking about the gaps between your teeth and your gums that make that shape. The ‘black’ part is simply the darkness you can see behind your teeth.
Often, it’s a combination of the shape of your teeth, the way your gums sit, and changes that have built up over the years. That’s why they can appear even in people who keep up with their dental check-ups.
The starting point is understanding what’s actually happening.
| Cause | What’s happening | What it leads to |
| Gum recession | The gum tissue pulls back slightly | Space opening up between the teeth |
| Bone loss | The underlying support reduces | Gums no longer fill the gap fully |
| Tooth shape | More triangular teeth leave more space at the gum line | Higher chance of visible gaps |
| Orthodontics | When the gum doesn’t fully adapt when using fixed braces or Invisalign | Black triangles can appear after treatment |
| Ageing | Natural changes in gum position happen as you grow older | Small gaps become more noticeable |
It’s rarely just one of these on its own, as usually, it happens because a combination of things is converging. Even with the perfect dental routine at home, you can still be affected by these gaps.
Once those black triangles are there, they’re not going to close up on their own, but they can be fixed. As we’ve seen, it’s all to do with the gum tissue not filling the spaces between your teeth, so the treatment that sorts it out is going to be directly addressing those gaps.
The right treatment for black triangles between your teeth depends on what exactly caused them and how visible they are. The good news is that there are a number of options to choose from.
Composite bonding is one of the most popular ways to tackle black triangle gaps in teeth, and it involves bonding tooth-coloured material across the gap to improve the overall shape. It’s nice and straightforward and usually done in one appointment. Our guide explains more.
Porcelain veneers come into play when a more significant gap needs to be hidden, which is why they’re often used in smile makeovers. They sit over the front surface of the teeth and can be shaped to close gaps while also improving symmetry across the smile.
When the position of the teeth is part of the problem, orthodontics can help by adjusting how they sit and meet. This can reduce or redistribute the gaps, and it’s particularly relevant when black triangles have developed after using Invisalign, hidden aligners or braces.
Where gum loss is the main driver of the problem, gum disease treatment can help improve how the tissue looks. They’re limited in what they can achieve though, and they’re not going to be the right fit in every case.
We’d love to be able to say they’re always controllable, but that would be wide of the mark. That said, there are quite a few things you can do to make them less likely to appear later. As you might expect, a lot of the tips below relate to how well you care for your teeth day to day.
Black triangles between teeth are common, but by doing the right things for your dental health, you can avoid them.
Black triangles between teeth aren’t completely avoidable, but by doing these small things here and there, you can significantly reduce your chances of experiencing them in the future.
Black triangles between teeth are more common than many realise, but the good news is you can do something about them. Not only that, but by taking more care when brushing and keeping up with your dental appointments, you really can tip the balance in your favour.
At Ringway Dental, we combine years of clinical experience and modern smile design tools to offer a service that’s aimed at helping you maintain your smile confidence for years to come.
You can get in touch with us or book online, and we’ll be more than happy to talk you through exactly how we’ll help you live a happy dental life.
Q – What are black triangles between teeth?
A – They’re the small dark gaps that appear between teeth at the gumline when the gum tissue no longer fills the space properly.
Q – Are black triangles permanent?
A – They won’t close up on their own, but they don’t have to be permanent. Once that space is there, it needs treatment to improve.
Q – Do black triangles mean gum disease?
A – Not necessarily. Gum disease can be a factor, but tooth shape, ageing, and orthodontic treatments can also make them happen.
Q – Can brushing too hard cause black triangles?
A – Yes. Too much prolonged pressure can wear the gums back. In fact, that’s one of the more common ways these gaps develop.
Q – Are black triangles more common after braces?
A – They can be. Moving teeth into a new position sometimes uncovers spaces that weren’t visible before, especially if the gums don’t fully adapt.
