Anomaly of the number and size of the teeth, supranumeric teeth (phylogenetic explanation)

Decreased number of teeth

 * Hypodontia - <6 teeth missing
 * Oligodontia - >6 teeth missing
 * Anodontia - All teeth missing. Associated with ectodermal dysplasias

Increased number of teeth

 * Hyperdontia (supranumerary teeth)
 * 1) Mesiodens - Lies between two central incisors incisors
 * 2) Paramolars - Alongside with maxillary molars
 * 3) Distomolars - Located distally of third molars

Anomalies in size of teeth

 * Macrodontia
 * Microdontia