Chewing gum releases hundreds of tiny plastic pieces straight into people's mouths, researchers said on Tuesday, also warning of the pollution created by the rubber-based sweet.
The small study comes as researchers have increasingly been finding small shards of plastic called microplastics throughout the world, from the tops of mountains to the bottom of the ocean -- and even in the air we breathe.
They have also discovered microplastics riddled throughout human bodies -- including inside our lungs, blood and brains -- sparking fears about the potential effect this could be having on health.
"I don't want to alarm people," Sanjay Mohanty, the lead researcher behind the new study which has not yet been peer-reviewed, told AFP.
There is no evidence directly showing that microplastics are harmful to human health, said Mohanty of the University of California, Los Angeles (UCLA).
The pilot study instead sought to illustrate yet another little-researched way that these mostly invisible plastic pieces enter our bodies -- chewing gum.
Lisa Lowe, a PhD student at UCLA, chewed seven pieces each of 10 brands of gum, before the researchers then ran a chemical analysis on her saliva.
They found that a gram (0.04 ounces) of gum released an average of 100 microplastic fragments, though some shed more than 600. The average weight of a stick of gum is around 1.5 grams.
People who chew around 180 pieces of gum a year could be ingesting roughly 30,000 microplastics, the researchers said.
This pales in comparison to the many other ways that humans ingest microplastics, Mohanty emphasised.
For example, other researchers estimated last year that a litre (34 fluid ounces) of water in a plastic bottle contained an average of 240,000 microplastics.
The most common chewing gum sold in supermarkets is called synthetic gum, which contains petroleum-based polymers to get that chewy effect, the researchers said.
However packaging does not list any plastics in the ingredients, simply using the words "gum-based".
"Nobody will tell you the ingredients," Mohanty said.
The researchers tested five brands of synthetic gum and five of natural gum, which use plant-based polymers such as tree sap.
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