In the oral cavity, although the shapes of adjacent teeth are in contact with each other, the gingiva between the adjacent teeth cannot completely cover the connection points of the two teeth, and the triangular gap can be directly seen with the naked eye, which is called the black triangle of the teeth. The black triangle is an irreversible process that tends to impact food and accumulate bacteria, which is not good for periodontal health. So, how is the black triangle formed?

How is the black triangle of teeth formed?

1. Suffering from periodontitis

Periodontitis is a serious oral disease that can involve periodontal supporting tissues such as cementum, gingiva, periodontal ligament and alveolar bone, often causing inflammatory destruction of periodontal supporting tissues. Periodontitis can cause alveolar bone resorption and gingival recession, resulting in the formation of a black triangle.

2. Congenital periodontal abnormalities

Everyone’s physique is different, and periodontal growth is also very different. According to the biological form of periodontal, it is divided into thin and thick. The former has a scalloped bone shape, and the gingival papilla is long and narrow, which is prone to permanent recession. triangle. The latter has thick and dense bone tissue, wide and flat gingival papillae, provides a good blood supply for the periodontal, and has a good biological tissue memory, and the gums are not prone to shrinkage.

3. Periodontal morphology

Periodontal morphology is one of the reasons for the appearance of black triangles after orthodontic treatment. Black triangles generally appear in the anterior teeth area, which greatly affects the image. Because of the teeth in the mandibular anterior area, the crown shape is long and narrow, showing a triangle, and the position of the contact point is slightly higher, which can lengthen the vertical distance of the crest of the alveolar ridge, so black triangles are prone to appear.

4. Age and root dispersion

After getting older, the height of the gingival papilla decreases by about 0.012 mm per year, so the elderly are prone to black triangles. The angle formed by adjacent teeth affects the incidence of black triangles. The more dispersed the roots, the higher the probability of black triangles.

5. Crowded teeth

Teeth crowding is a common factor that causes black triangles, especially for people with severely crowded upper and lower front teeth, it is not easy to clean the soft scale and calculus, and the gums are stimulated by inflammation for a long time and cause gingival recession. After a series of corrections, when the originally crowded teeth are aligned, the space between the adjacent teeth will be exposed, so the black triangle of the gum will appear.

Kind tips

The main reason for the appearance of the black triangle is that the teeth are not cleaned well, which causes the formation of plaque and calculus, which causes the gums to shrink. Therefore, it is necessary to master the correct brushing method. Brush your teeth once a day in the morning and evening, and choose a toothbrush with a soft brush head. Use an irrigator or dental floss to clean food debris between your teeth after brushing to protect your mouth. Active treatment of periodontal disease, cleaning every 6 months can remove tartar and soft scale in time. If a black triangle appears after orthodontic or orthodontic treatment, it is necessary to improve the problem by doing veneers and deglazing on the adjacent surfaces.