tooth brushing vs. floss

In a brief lecture last year by an English Dentist my class was told that brushing is no more effective than flossing is (if the patient gets fluoride supplements). The lecturer also said there are good studies to back up this claim. I have searched for these studie to no evail. Is this true? Do you know any studies that refute or back-up this claim? thanks
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums