flossing and/or brushing

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I know of someone that flosses constantly. I am told he flosses before eating, after eating, while watching TV, while standing on the porch, in his car, at the movie theater, before se(!), after se(!), and on and on. The thing is, I am also told, he rarely ever bruhses his teeth or uses mouth wash. So what do you think, is brushing as important as flossing or is flossing more important than brushing? How important is using mouthwash? Is this person compulsive? (Oh that's another subject!)