👉 The term "impalpable" is a medical term used in dentistry to describe an impacted tooth. Impacted teeth are those that do not fully align with their adjacent teeth, and can cause pain or discomfort when they come into contact with other teeth. The term comes from the Greek word "impala," which means "to touch." When a tooth is impaled against another tooth, it may feel like it cannot move because there is no space for it to do so. This condition