By Amber Goodhand - Breaking Celebrity News Reporter

Lindsay Lohan was approved for a leave of absence from her shoplifting program to have dental work done on October 14, Breaking Celebrity News has exclusively learned.

The Mean Girls actress shocked everyone on October 12 when she walked a red carpet in Los Angeles with teeth that were stained brown and appeared rotting.

But when she was photographed that following weekend, her smile showed off perfect pearly whites!

As Breaking Celebrity News was first to report, Dr. Pankaj Singh said it appeared Lindsay had “an emergency dental intervention” to fix her gnarly grill -- and he was right.

“Either she had some bondings or veneers done to cover up the stained and decayed teeth,” Dr. Singh told Breaking Celebrity News.

Proof that the 25-year-old had dental work done is in her probation report, obtained by Breaking Celebrity News.

In the piece referencing Lindsay’s completion report at the shoplifting alternative program, a record of her excused absences was listed and among the numerous dates she was out of town for work gigs, is an October 14 absence for a dental appointment.

“Ms. Lohan has not been absent to any regularly scheduled activities, except the session scheduled for her on Friday, October 14, 2011 due to her need to seek dental work,” the report states.

“Client presented evidence of attending her dentist office. As a result her absence was excused.”

A source close to the situation told Breaking Celebrity News that Lohan was “mortified” b