Answer: The failure of one or more teeth to develop (partial anodontia), is an anomaly that occurs in a small percentage of the population. The most common teeth to be congenitally missing are the third molars (wisdom teeth), lower second premolars, and the upper lateral incisors (in that order). In fact, there is about a 25% chance that someone will not develop one or more of their wisdom teeth. Additionally, the congenital absence of a baby tooth is not common. However, if this were to occur, it is most likely the upper lateral baby incisor that is missing. In these cases, when a baby tooth is not present, it becomes highly unlikely that its permanent replacement will develop as well.