So long, dental plan? But Lisa needs braces.
The American Association of Orthodontists says between 50% and 75% of the general population could benefit from some kind of orthodontic treatment. The majority of patients in the United States and Canada begin treatment between the ages of 9 and 14, but there has been a rise in adult treatment as well: from 1989 to 2010, the AAO says, the adult population of ortho patients is up 23%.