Not to burst your bubble, but your gum might be packed with plastic. A new study found that chewing a single piece releases hundreds — if not thousands — of microplastics into your saliva, which you’re most likely swallowing.

Chewing a single piece of gum can release hundreds to thousands of pieces of microplastic into the saliva in your mouth—likely to go on to be swallowed. This is the warning of researchers from the University of California,

A study found that the popular product can release hundreds to thousands of microplastics per piece into saliva and potentially be ingested.