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TIL boiling water can remove microplastics
(pubs.acs.org)
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It's MICRO plastic, literally too small for you to see. If you look at a new tooth brush under a microscope compared to a used one there are very clear signs of wear.
Electron microscope view: https://www.medicaldaily.com/pulse/after-you-brush-your-teeth-3-months-what-your-toothbrush-looks-why-you-need-replace-361258