What Causes Black Triangles between Teeth
Your teeth and gums should fill the space of your smile. The high contrast between your lips, gums, and teeth draws the eye and creates an attractive appearance. But when your teeth and gums don’t fill that space, what’s left is negative space. These are black triangles that show through into your mouth.
For many people, black triangles are developmental. They are one consequence of crooked teeth, crowded teeth, triangular-shaped teeth, or teeth that are too small.
Receding gums are the most common cause of developing black triangles. As your gums begin receding, among the first things to go are the interdental papilla, the parts of the gums that fill up the space between your teeth. As these papilla go, they leave an empty space behind. Gum disease, aggressive tooth brushing, oral piercings, orthodontics, and other factors can contribute to receding gums.
Other times, black triangles can be caused by imperfect cosmetic dentistry work. This can include over-aggressive gum recontouring as well as porcelain veneers or dental crowns that are not properly sized or placed, leaving space below or around them.