Here’s something to think about the next time you drink a diet soda. It can destroy your teeth just like a meth habit. That’s according to a new study from Temple University School of Dentistry.

Researchers used dental equipment to measure the damage in people’s mouths: Some were meth users, others were cocaine users, and the rest were diet soda drinkers, who drank about two liters a day.

The result? They all had the same types and severity of damage - from cavities, to rotting teeth. So, what’s so bad about diet soda?

Experts say that a lot of people think that diet soda is healthier than regular soda – because it doesn’t have any cavity-causing sugar. But in this case, the sugar isn’t the bad guy. Experts say that meth, cocaine and diet soda are all highly acidic. And constant exposure to acid is a recipe for tooth erosion and major oral damage.

But you don’t need to give up your diet soda habit completely. You can protect your teeth by sipping soda through a straw to prevent the acid from touching your teeth. And drink water after you drink soda. That’ll wash away a lot of the acid before it can attack your teeth and erode the enamel.