Section 70.352.020 - Registration-When required(1) Each dental laboratory operating, doing business, or intending to operate or do business in this state must register with the department and pay the fee established pursuant to RCW 70.352.030 and 70.352.060.(2) A dental laboratory is considered operating or doing business within this state if its work product is prepared pursuant to a work order or work authorization originating within this state.(3) This chapter does not apply to a dental laboratory operating under the supervision of a practicing dentist licensed under chapter 18.32 RCW in a dental office or as a part of a dental practice, provided that the laboratory does not perform work pursuant to prescriptions or work orders originating from outside of the dental practice or supervising dentist's office, or in an educational institution as part of the institution's educational program provided that the laboratory does not routinely perform work pursuant to prescriptions or work orders originating from outside of the educational institution.