Are diastemas normal and when should I consider diastema closure?

Midline diastemas in the primary dentition are common. They are usually associated with a thick maxillary frenum attachment and do not warrant treatment. However, clinicians should appropriately assess large midline diastemas in the primary dentition to rule out the presence of supernumerary teeth.

In the permanent dentition, maxillary central incisors erupt buccal to the primary centrals and their eruption often creates a midline space. However, as the lateral incisors erupt, the space tends to close and complete closure of this space occurs once the permanent canines erupt. If there is any remaining midline space, this can be addressed orthodontically or restoratively.

Source: Dental Secrets, Elsevier, 2015