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A bit of lapis lazuli — a rich blue pigment — is trapped within a central tooth's dental tartar on this lower jaw of a European woman who died sometime between A.D. 997 and 1162. Christina Warinner/Science Advances hide caption

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Christina Warinner/Science Advances

A Blue Clue In Medieval Teeth May Bespeak A Woman's Artistry Circa A.D. 1000

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Surface stains from things like coffee, tea, tobacco and red wine can be lightened with routine brushing, flossing and professional cleaning in the dental office. But deeper stains that come with age and damage to the tooth require bleaching agents or veneers. Katherine Streeter for NPR hide caption

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Katherine Streeter for NPR

Navigating The 'Aisle Of Confusion' To Whiten Your Teeth

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The MD Brush toothbrush forces users to hold it at the optimal angle relative to their gums. Shuyao Chen/NPR hide caption

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Shuyao Chen/NPR

Brush Yourself Off And Try Again: An Invention Story

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'Smile Stealers' Recalls A Time When Dentists Routinely Reached For The Pliers

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Dr. Joel Funari performs some 300 tooth extractions annually at his private practice in Devon, Pa.. He's part of a group of dentists reassessing opioid prescribing guidelines in the state. Elana Gordon / WHYY hide caption

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Elana Gordon / WHYY

Dentists Work To Ease Patients' Pain With Fewer Opioids

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Vidhya Nagarajan for NPR

No-Drill Dentistry: Fluoride Treatments Can Prevent Cavities In Adults

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