Jessica Simpson's dentist, Dr. Bill Dorfman, says he is "blown away" by the U.S. singer and actress's public admission she doesn't brush her teeth every day.

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Simpson said on a recent visit to "The Ellen DeGeneres Show" that she only brushes her teeth about three times a week.

"I couldn't believe it when she told Ellen she doesn't brush her teeth, but what, three times a week? As her dentist, I was totally blown away! ... I'm going to have to get on her next time I see her," Dorfman told TV's "Inside Edition."

The dentist went on to say he has taught Simpson good oral hygiene and is mortified she doesn't brush as regularly as she should.

"She said, 'Doc, do I really need to floss my teeth?' I said, 'Jessica, make sure you floss the ones you want to keep,'" Dorfman recalled.