28 Aug
Mouth with black triangles between teeth

Black Triangles Between Teeth

Are you concerned about those unsightly black triangles between your teeth? These triangular gaps can be an unwanted cosmetic issue, affecting both your oral health and appearance. Also known as "black spaces" or "open gingival embrasures," black triangles occur when there is a visible space between teeth, often near the gumline.

While black triangles may seem harmless, neglecting them can lead to various oral health problems. The gaps can trap food particles and bacteria, contributing to increased plaque buildup and dental decay. Moreover, these spaces can lead to gum inflammation, making your teeth vulnerable to developing periodontal disease.

Additionally, the impact on your appearance cannot be overlooked. Black triangles can cause self-consciousness and affect your smile's aesthetics, potentially lowering your self-esteem and confidence. Taking proactive steps to address this dental issue can help you achieve better oral health, have a healthier mouth and a more confident smile.

Understanding What Causes Black Triangles

What are Gingival Black Triangles?

Gingival black triangles are spaces between the teeth that are devoid of gum papilla. The papilla is the small pointy portion of the gum that comes between the teeth. The space appears somewhat like a triangular gap, and it looks black because of the shadow the back of the oral cavity casts on it.

Gingival black triangles are generally considered esthetically displeasing as the gum tissue and symmetry plays an important role in the smile esthetics. Some patients may experience phonation issues if the spaces are especially pronounced. Moreover, these spaces allow food and plaque to get trapped and accumulated, leading to gum inflammation, bone loss and tooth decay.

Factors Contributing to the Development of Black Triangles

Several factors can contribute to the development of black triangles between teeth. One major factor is the natural shape, size and positioning of the teeth. Triangular tooth shape will lead to more pronounced black triangle open embrasures. In other cases, teeth can have a natural spacing that creates gaps or black triangles.

Additionally, gum recession can play a role. It is a common culprit behind black triangles. When the gingival (gum) tissue recedes or pulls away from the tooth, the underlying bone is lost. And when the gum tissue pulls away from the teeth, it exposes the root surfaces, creating gaps between the teeth. This can create the appearance of black triangles between the teeth, as the gum tissue no longer fills the space between them.

Not surprisingly then, periodontal disease is another big factor. If proper oral hygiene, such as regular brushing and flossing, is not practiced, plaque and bacteria can accumulate, leading to periodontal disease progression and gum recession. Gum disease can cause severe bone and gum loss and can lead to exposed root surfaces and black triangles.

Another reason could be thin gum biotype or tissue quality. Thin tissue can enable recession more so than thick tissue biotype.

Post orthodontic treatment can also cause black triangles. They may appear after braces or Invisalign treatments if the root relationship between two adjacent teeth is divergent. This prevents the two teeth from approximating enough to allow for the gum papilla to fill in the gap.

Finally, age could also play a role – though this is mostly due to the increased incidence of bone loss and gum recession with age.

Treatment Options for Black Triangles

Overview of Various Treatment Options Available

When it comes to treating black triangles between teeth, there are several different options available to consider. The most appropriate treatment will depend on the severity of the condition and the patient's individual needs.

Dental bonding as a minimally invasive solution for closing black triangles

One of the simplest and least invasive (and somewhat reversible) treatment options to closing these unsightly gaps is with dental bonding. It is a popular choice for closing black triangles, especially in cases where the gaps are relatively small. This procedure involves the application of a tooth-colored composite resin to the affected areas, which is then shaped and polished to match the surrounding teeth. Dental bonding offers a non-invasive and cost-effective solution for improving the appearance of black triangles.

Conventional dental bonding will yield good results, but for an excellent outcome a technique called BIOCLEAR® Composite Injection Molding Technique offers the best esthetics. You can see some examples of this in our smile gallery that show how bonding can help overcome black triangles.

This bonding technique is minimally invasive and requires local anesthesia only. There is no tooth removal, except for roughening the tooth surface to prepare it for the bonding.

After the dental plaque is identified with a disclosing solution, it is removed and the teeth are polished with pumice. This is done to enable a better bond strength between the composite resin and the tooth surface. If any decay or previous filling is present, it is removed at this time.

Depending on the size of the black triangle, an appropriate size BIOCLEAR® dental clear matrix is selected, and placed on the tooth to help build the new tooth shape.

Tooth reshaping with veneers or crowns

For more advanced cases, restorative techniques such as porcelain veneers or crowns will be the treatment of choice. Veneers are thin shells made of porcelain or composite resin that are bonded to the front surface of your teeth, effectively covering any gaps or imperfections. Crowns, on the other hand, are custom-made caps that fit over your entire tooth, concealing black triangles and providing a more even and uniform appearance.

Use of orthodontic procedures like Invisalign or metal braces for correcting black triangles

In some cases, orthodontic procedures may be necessary to bring the teeth together and close the black spaces. Clear aligners or traditional braces can help move the roots of two adjacent teeth closer and parallel together and gradually move teeth into their proper positions, closing any gaps in the process. This treatment option is typically recommended for more severe cases or when there are other dental alignment issues present and is often combined with tooth contouring, also known as enameloplasty. This procedure involves carefully reshaping of a triangular tooth structure and removing a small amount of enamel to create a more natural and aesthetically pleasing shape and eliminate black triangles.

Tissue plumping with fillers

Milder cases of open embrasures can also be camouflaged by bulking out the existing gum papilla with fillers.

Prevention Strategies to Avoid Black Triangles

The likelihood of black triangles forming between your teeth can be greatly reduced and prevented by following these strategies:

Routine dental check-ups and professional cleanings

Regular visits to your dentist are crucial in preventing black triangles between teeth. During these check-ups, your dentist can:

  • Detect early signs of gum disease or gum recession.
  • Provide professional cleanings to remove plaque and tartar buildup.
  • Recommend appropriate oral hygiene techniques and tools tailored to your specific needs.
  • Identify any potential risk factors for black triangles and offer preventive measures.

Improved oral care practices

In addition to regular dental visits, adopting the following oral care practices can help prevent black triangles between teeth:

  • Brush your teeth using a soft-bristled toothbrush and fluoride toothpaste at least twice a day. Avoid aggressive brushing, as it can contribute to gum recession. Use gentle circular motions when brushing.
  • Floss daily to remove plaque and debris from between your teeth and prevent gum recession. Consider using interdental brushes to effectively clean between teeth and remove plaque buildup.
  • Practice proper tongue cleaning to remove bacteria that can contribute to gum disease.
  • Use an antimicrobial mouthwash to help reduce harmful bacteria in your mouth.


Fixing black triangles between your teeth is done not just for cosmetic reasons but also to maintain optimal oral health and achieve a confident smile. Hopefully, the above post, helps you get a better understanding of the causes, prevention strategies, treatment options, and the importance of addressing gaps between teeth.

In recap, black triangles between teeth can be caused by gum recession, orthodontic issues, or several other factors. Maintaining proper dental hygiene and regularly visiting a dentist can help prevent the formation of black triangles. Cosmetic dentistry procedures, such as dental bonding or veneers, as well as restorative treatments such as dental crowns, can improve the appearance of the smile and fill in these gaps.

However, it is important to note that each case is unique and may require different treatment options. Only a dental professional can assess your specific situation and provide the most appropriate course of action. If you need help addressing gaps between your teeth do not hesitate to schedule an appointment with us and start your journey towards a healthier and more beautiful smile today!

Looking for options to fix black triangle gaps in your smile?

If you have gums that are receding or have developed black triangles in your smile, schedule a consultation with Dr. Tufa as soon as possible.

You can book a consultation by calling our Acton, MA office or schedule a dental appointment online.


Heni Tufa

Dr. Tufa is a general dentist in Acton, MA who is also an Invisalign Provider and certified Botox dentist.