A new study reports that diet soda is as bad for your teeth as methamphetamine. So we thought we'd show you celebrities doing "meth."

Dr. Mohamed Bassiouny, a professor of restorative dentistry at the Temple University School of Dentistry in Philadelphia said, "You look at it side-to-side with 'meth mouth' or 'coke mouth,' it is startling to see the intensity and extent of damage more or less the same."

Methamphetamine, crack cocaine, and...diet soda?

It's true. Dr. Mohamed Bassiouny reveals in a recently published study for General Dentistry.

The acid in soda is citric acid, and if you don't have good oral hygiene and brush constantly, your teeth will decay just like it does for crack cocaine and meth users.

Here is the most harrowing result of Dr. Bassiouny's study:

"In his study, he found that a woman in her 30s who drank 2 liters of diet soda daily for three to five years experienced tooth rot and decay remarkably similar to that suffered by a 29-year-old methamphetamine addict and a 51-year-old habitual crack cocaine user."

Gross!

But diet soda has long been the cure-all for celebrities looking to stay trim, while also enjoying the fizzy advantages of diet soda.

Here are some celebrities we've found who enjoy "meth," or diet soda (via website: Celebrities Drinking Diet Coke)

90210 actress, Jessica Lowndes:

South African actress and star of Monster and Two Days In the Valley, Charlize Theron, loves her some diet coke, or "meth," as the study found:

Sweeney Todd: The Demon Barber of Fleet Street and Conversations With Other Women star, Helena Bonham Carter enjoys her diet coke. We're not sure if her husband, Tim Burton, approves of all her meth, whoops, Diet Soda intake:

The New Girl star, Zooey Deschanel, enjoys diet soda, even if her indie image might suffer from the connection to methamphetamine:

Seinfeld's Elaine Benes enjoys diet coke, played by Veep star, Julia Louis-Dreyfus.

But perhaps the celebrity who enjoys diet coke the most, is country musician and rampant boyfriend-haver, Taylor Swift:

Not only does she love "meth"--excuse us, diet soda--but she's willing to endorse it!

So there you have it: diet soda is as bad for you as meth and crack cociane, but that hasn't stopped these celebrities from indulging in everyone's favorite calorie-free concotion.