Even the remotest islands have no lack of used toothbrushes. Researchers studying Cocos Keeling Islands — 6 square miles of uninhabited land 1,300 miles off Australia’s northwest coast — found 373,000 ...

During my lifetime, I’ve used and thrown away about 200 toothbrushes (around four per year, like my dentist has always advised). Each one, made entirely of plastic, is still sitting in a landfill ...

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