Patients with hairy tongue syndrome—which can also turn tongues black, brown, yellow, or blue—often report gagging, mouth dryness, or bad breath.

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<p>Patients with hairy tongue syndrome—which can also turn tongues black, brown, yellow, or blue—often report gagging, mouth dryness, or bad breath.</p>
<p>Read this story <a href="https://www.wired.com/story/rare-case-green-hairy-tongue-pure-nightmare-fuel/">here</a>.</p>

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