Which device is specifically used to remove excess fluids from the patient's mouth during procedures?

The saliva ejector is specifically designed for the purpose of removing excess fluids from a patient's mouth during dental procedures. It functions by gently suctioning saliva and other fluids, helping to keep the treatment area clear and dry. This is essential for maintaining visibility and a clean working environment in the oral cavity, which allows the dentist or dental assistant to perform procedures more effectively.

While other devices, such as a suction pump or aspiration unit, may also be capable of removing fluids, they are typically used in different contexts or for different volumes of fluid. A high-speed handpiece is primarily an instrument used for cutting and shaping tooth structure rather than for fluid removal. Therefore, the saliva ejector is the best choice for the specific task of managing excess fluids during dental treatment.