What device uses water to create suction in the oral cavity?

The oral-evacuation system is designed to effectively remove fluids and debris from the oral cavity during dental procedures. This system often utilizes water to create a vacuum effect, which aids in maintaining a clear working site for dental professionals.

Using water in this context helps to create a necessary suction power that keeps the area free of saliva and other fluids, improving visibility and accessibility for the dentist or dental hygienist. The term "oral-evacuation system" comprehensively encompasses the technology and methodology employed in the dental field to ensure cleanliness and efficiency during surgeries or routine procedures, making it the correct choice for the question.

In contrast, while options like dental suction machine may sound similar, they typically refer to specific instruments rather than the broader system used during various oral care activities. The oral-evacuator and hydro-sucker might also be used in specific contexts, but they do not capture the complete function and application as clearly as the oral-evacuation system does.