The congenital absence of 1 to 6 teeth (excluding third molars) is termed what?

Dental agenesis (congenital absence of teeth) is classified by the number of missing teeth: Hypodontia = agenesis of 1–6 teeth excluding third molars; Oligodontia = agenesis of more than 6 teeth excluding third molars; Anodontia = complete absence of all teeth. Hypodontia is the most common dental developmental anomaly, affecting approximately 2–8% of the general population. The most frequently missing teeth (excluding third molars) are mandibular second premolars and maxillary lateral incisors. Hypodontia is primarily genetic in origin and may be associated with syndromes such as ectodermal dysplasia.