The term DENTAL UNIT can be broken down into two words: TOOTH (5 letters) and DENTAL (7 letters). A dental unit is a piece of equipment used in dentistry, typically consisting of a chair, a delivery system, and a light source. It is used to provide dental care to patients, such as cleaning teeth, filling cavities, and performing other procedures. The dental unit is an essential part of any dental practice, as it allows the dentist to perform their job efficiently and effectively.