??? ????? (?? ?????? ??????? ?? ???? ???? ?? ???) ?????????? ???? ????? ?? ???? ?????? ?? ????? ???? ????? ????Oral diseases may be viewed as a general public health challenge due to their large prevalence and considerable social impression.[two]Shaun Howe, Dental Hygienist ‘I've never ever performed study as I don't have the best notice span! Th