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A dentist's chair works by using a hydraulic system. A large piston presses hydraulic fluid into tubes that vary in size. This piston allows the fluid to move into tubes and create lift.

Answer: Hydraulic system

Explanation:

A hydraulic system is attached with the dental chair so as to facilitate the process of cleaning mouth and teeth with water and other essential fluids during the dental treatment. The pistons present in the hydrualic sytem allows the suction of fluids helps cleaning process.

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