When Colgate was developing its new low-waste Keep toothbrush, which has a reusable aluminum handle and replaceable heads (a starter pack costs $9.99; additional heads are $4.99 for two), the company ...

Our landfills are a graveyard for old, plastic toothbrushes. Last year, 495 million nonelectric toothbrushes were purchased in the U.S. They’re not recyclable, which means the vast majority get tossed ...