Don’t get Nathan Jones started on xylitol, the active ingredient in his chewing gum, nasal spray, and other products. He’ll talk your ear off about its wondrous powers against tooth decay, as well as its potential to fight Covid, heart disease, Alzheimer’s — you name it. For now, Jones, the founder of Xlear, can’t make those claims in his company’s advertising. But if the lawsuit his company brought against the Federal Trade Commission succeeds, he’ll likely be able to say anything he wants.

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