Diastema |
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Diastema is a gap or space between two teeth. The term is most commonly applied to be an open space between the upper incisors (front teeth). It happens when there is an unequal relationship between the size of the teeth and the jaw. Many species of mammals have diastema as a normal feature, for example the gap between molars and incisors in rodents.
Diastema is sometimes caused or exacerbated by tongue thrusting or the pulling action of a labial frenulum (the tissue around the lip), which can push the teeth apart.