Teeth

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?