If the final tooth is a third molar, it is usually of little value to keep and can be extracted. The third molar is also known as a wisdom tooth because it often erupts incorrectly or incompletely, which can lead to decay. Wisdom teeth are also prone to inducing pericoronitis in the surrounding soft tissues, so extraction is usually recommended. However, missing third molars are also more common in modern times, and if the final tooth is a second molar, it is usually recommended to treat and retain it. Because second molars are important for veneers and prosthetics, extraction is not recommended. The distinction between second and third molars can be made by clinical examination and full-mouth surface planimetry.