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Chapped lips are a problem that 100% of humans suffer from. Okay, we might have made that statistic up, but you get it. No matter how often you reapply your lip balm, your lips sometimes just can’t seem to not be chapped, especially when the weather is cold and dry. But guess what. Toothpaste could be behind your perpetually chapped lips, as it turns out. Yes, TOOTHPASTE.

You’ve probably heard that the more you apply lip balm, the more you rely on it. That could be part of the issue , but your toothpaste may also be the culprit.

This revelatory news was stumbled upon by Refinery29 in a Reddit thread discussing how to solve the issue of chapped lips.

Reddit user dannelinflannel began the thread by explaining that switching to a new toothpaste completely cleared up the chapped lip situation.

Other Reddit users experienced the same relief after swapping to a toothpaste designed specifically for sensitive teeth. Many people believe that sodium laureth sulfate (SLS), a foaming surfactant in many toothpastes, is to blame.

Switching toothpastes may help, but you’ll need to check the ingredient label to look for common triggers such as SLS. Then by trial and error you should be able to figure out which toothpaste works best for you.

“A study from the University of Oslow, Norway showed that canker sores are often precipitated by exposure to the common foaming ingredient, sodium laurel sulfate,” New York dentist, Gerry Curatola, DDS told Living Healthy.

If a toothpaste is SLS-free, the brand will likely advertise that on the tube. So if your lips are just chronically chapped no matter what you do, it might be worth it to switch up your toothpaste. (But also make sure you’re drinking enough water, because dehydration can also be the culprit!.)