Changing the makeup of saliva to melt plastic

I am writing a book in which criminals get their hands on a polymer which resembles chewing gum , but alters their saliva. This allows them to burn holes into walls made from plastic used as building material in an alternate future of earth.

-Is it possible to create a "gum" that alters saliva enough to burn through plastic without significantly harming the user?

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Changing the makeup of saliva to melt plastic

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