For this story, I talked to dentists about determining which toothpaste to buy and used their guidance to round up options made with fluoride from brands like Crest, Colgate and Sensodyne.

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They advise people to go to their dentist for advice on bleaching, or whitening, their teeth. And they say it is better to stick to using a regular fluoride-based toothpaste. Charcoal was first ...

Dr. Michael J. Wei, DDS, FIADFE, at Manhattan Cosmetic Dentist, agrees, touting the fluoride toothpaste's ability to prevent cavities and improve breath overall. Colgate ...