Final answer:
An unerupted tooth that stays within the jaw beyond its normal eruption time is called an impacted tooth, which often refers to wisdom teeth, or third molars.
Step-by-step explanation:
Any tooth that remains unerupted in the jaws beyond the time at which it should normally erupt is referred to as an impacted tooth. This condition is commonly seen with wisdom teeth, also known as third molars, which are supposed to emerge during late adolescence or early adulthood. However, sometimes these teeth fail to erupt properly and remain lodged in the jawbone or gums, necessitating orthodontic surgery to remove them. This is because during the normal course of dental development, the human mouth can sometimes be too small to accommodate these teeth, leading to potential crowding and alignment issues.
The permanent teeth, which are the second set of teeth, usually replace the deciduous teeth during middle childhood. These permanent teeth include incisors, canines, premolars, and molars. Wisdom teeth are the last to emerge, if at all, and their impaction is often due to insufficient space in the dental arch to accommodate these large molars.