Why Dentists Remove Teeth For easy extraction, the dentist loosens the tooth using a lifting device. The dentist then uses dentures to remove the tooth. Operational extraction – a more difficult process if a tooth has broken off or not broken in the mouth on a gum line. 5 Reasons for Tooth Extraction Here are some reasons to extract the teeth. 1. Impaction Dental impaction happens when one tooth is growing directly against another. The tooth is infectious and …