[tqi]

That's not the point. From the article:

“When you look at the dental insurance model, it doesn’t protect the patient from financial risk. It’s the opposite,” said Marko Vujicic, chief economist and vice president of the Health Policy Institute at the American Dental Association. “Once the benefit runs out, the $1,400 or whatever it is, all of that financial burden is on the patient. So it protects the insurer, they’re limited on their exposure.”

In other words, there is no real benefit to offering a "good brusher" discounts.