Dental doctors or a dentist concentrate on many fields of study and therefore are characterised by the next key sorts; ??? ?? ??? ??? ??? ???? ??? ????? ??? ?? ??????? ?? ????? ??? ?????? ?? ????? ?? ???? ?? ????? ?????? ??? ??????? ???? ? ????? ?? ????? ???? ? ???? ?? ???? ??? ???? ? ???? ???? ?