Regular (daily) dental flossing is recommended for preventing oral diseases, but adherence
is unsatisfactory. Social cognitive theory specifies determinants of dental flossing: Cognitions
about risk, positive and negative outcome expectations and the perceived ability to perform
behaviour predict motivation, which in turn predicts behaviour. Recent research suggests that
motivation alone may not suffice to predict behaviour, and proposes if-then-planning. This study
aims to predict flossing adherence from social cognitive variables and planning.