DEAR DOCTOR K: I brush and floss regularly. Do I need to use mouthwash too?
DEAR READER: Judging from the ads, you need mouthwash to prevent plaque (the yellowish film of bacteria that attaches to your teeth and leads to cavities) and gingivitis (inflammation of the gums). But mouthwash actually plays a fairly minor role in the prevention of plaque and gum disease. Brushing and flossing are much more important.