Generally four third molars will begin to erupt between the ages of 17 and 25. Evaluation of third molars is done at this time with a panoramic radiograph. Extractions are sometimes performed for orthodontic treatment or orthognathic surgery as part of the treatment process. Other conditions which warrant extraction of impacted third molars are periodontal conditions, cysts, pericoronitis, and carious lesions. In most cases these teeth are asymptomatic at the time of extraction, and are being pulled to prevent future problems. These can be predicted by the position of the teeth on the panoramic radiograph.