(USA) Teenagers don't drink water.

Some Gains, Some Losses in War on Cavities
By Gary White
The Ledger
Jodi Levins of Winter Haven sees a cautionary tale in the mouths of her two sons. Jacob, 5, had no cavities during his most recent trip to the dentist. That used to be a routine outcome for her older son, Jeremy, 16. But about a year ago, Jeremy went in for a checkup and learned he had six cavities.