Any person “practices as a dental assistant” within the meaning of this chapter who provides patient services in cooperation with and under the direct supervision of a currently registered and licensed dentist in Missouri. A currently registered and licensed dentist may delegate to a dental assistant, certified dental assistant or expanded functions dental assistant, under their direct supervision, such reversible acts that would be considered the practice of dentistry as defined in section 332.071 provided such delegation is done pursuant to the terms and conditions of a rule adopted by the Missouri dental board pursuant to section 332.031; except that, no such rule may allow delegation of acts that conflict with the practice of dental hygiene as defined in section 332.091, with the exception that polishing of teeth, placement of pit or fissure sealants, and application of topical fluoride may be delegated to a dental assistant, certified dental assistant or expanded-functions dental assistant.