Diastema: what it is, causes and how to correct it
February 11, 2025
The diastema is one of the most recognisable dental features. For some people it's part of their smile; for others it's a reason to come in. Either way, it's worth knowing why it appears.
What is a diastema?
A diastema is the visible gap or space between two teeth, usually between the upper incisors. It can be a single gap or several along the dental arch. It isn’t always a problem: in many cases it’s purely an aesthetic matter.
Why it appears
The most common causes are:
- Disproportion between teeth and jaw. When the teeth are small in relation to the bone, there’s leftover space.
- A large labial frenum. A prominent frenum between the incisors can stop them from coming together.
- Childhood habits. Thumb-sucking or constant tongue thrusting can push the teeth apart.
- Tooth loss or gum disease. A missing tooth or loss of support causes the others to shift.
How it’s corrected
If you decide to close it, the options range from orthodontics (the most complete solution, because it treats the cause) to aesthetic treatments such as veneers or composite when the gap is small. The choice depends on the origin and size of the diastema, something we assess at the first visit.
Dudas frecuentes sobre orthodontics
Does a diastema always need treating?
No. If it doesn't cause functional problems and doesn't bother you aesthetically, there's no need to correct it. It's a personal decision.
Can it reopen after orthodontics?
That's why keeping your retainers for as long as we tell you is key: they stabilise the result and prevent the gap from reappearing.
