You go in to get your teeth cleaned and every time they're like "You know there is this thing called floss and you can occasionally use it to dislodge the Peanut Butter M&Ms from your teeth?"
During such lectures I am thinking HOW DARE YOU QUESTION MY IMPECCABLE MOUTH-CLEANSING ROUTINE! I FLOSS EVERY DAY!!!" but all I can do is sheepishly say "I do floss."
Then the dentist ignores me and goes on telling me more about flossing and how I should really start doing it or my teeth will all fall out and I will get rabies and gingivitis and experience something called "bone loss."
On that last point they are indeed accurate. There is no 'bone' killer like a visit to the dentist.