Final answer:
The dental office gets its water from the public water supply and it is routed to the dental unit waterlines (DUWLs) in the dental chairs.
Step-by-step explanation:
The dental office gets its water from the public water supply, which is usually sourced from rivers, lakes, or underground aquifers. This water undergoes treatment to remove impurities, such as bacteria, chemicals, and sediments, before reaching the dental office.
Once the water enters the dental office, it is routed to the dental unit waterlines (DUWLs) found in the dental chairs. These DUWLs carry the water to various instruments and equipment used during dental procedures.