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The dental assistant should set up the dental hand instruments on a tray in order of use in part to not delay the procedure. Most dental hand instruments are made of stainless steel, carbon steel, or plastic and must be strong enough to withstand constant use and sterilization procedures. Most dental hand instruments are used to examine the mouth and teeth, to professionally clean the teeth, to cut the teeth or remove cavities, to place filling materials, and to carve dental fillings. The dental assistant is responsible for knowing what each dental hand instrument does and which one the dentist will need during a procedure. Each dental hand instrument has a defined use in a dental procedure.