This contains processes like whitening and scaling. They often assist in the modeling and placement of dentures and other prosthetic paraphernalia with the oral cavity.???? ?? ?? ?????? ??? ??? ??? ????? ?? ?? ?? ???? ?????? ?? ????? ?? ????? ???? ????? ??? ?????? ?? ??? ??? ???? ?? ??? ??? ???????? ???? ???? ????? ?? ??? ???? ????? ?????? ?? ????