jessica simpson

Photo: Ice/X17online.com

It seems Jessica Simpson's recent revelations about her bad oral hygiene have left her dentist with a bad taste in his mouth.

Dr. Bill Dorfman, a cosmetic dentist in Beverly Hills, tells Inside Edition he wasn't smiling after learning that Simpson admitted to talk-show host Ellen DeGeneres on April 28 that she doesn't brush daily.

And, boy, did that tooth, er, truth hurt!

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

So what's the singer's excuse? "My teeth are so white and I don't like them to feel too slippery," the 29-year-old host of VH1's The Price of Beauty -- who claims she'll touch-up her teeth with a T-shirt -- told DeGeneres. "But I do use Listerine and I do floss every day."

That news should please the mortified Dr. Dorfman, who recalls, "She said, Doc, do I really need to floss my teeth? I said, Jessica, make sure you floss the ones you want to keep."