When I was little, "they" said I should brush my teeth. Regularly. So I did. Much later "they" said I needed to floss as well. I declined. I even got a dispensation from a real dentist because my teeth were so crooked and I was afraid I would pull out one of the many, many fillings. But then "they" said I should brush my tongue too. So i did. But now, so many years later, "they" are telling me to brush the top of my mouth. Where does this all end?