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Well, in USA that is not surprising at all. But elsewhere I would not really assume it.
Even plant based gums, like those made from chicle sap are a polymer chain that will chip off with chewing and enter your system. The major difference is that those particles are typically still biodegradable. That doesn't necessarily make them safe, but they shouldn't stick around forever.
If you can put a plastic straw in your mouth...
It is kind of weird, but the reasoning holds. Certain artificial polymers may well be allowed in a lot of countries. The EU doesn't even like mixing wine grapes, though, so maybe not them.