In a nutshell
A hairy tongue looks hairy but does not consist of hair. Elongated papillae on the tongue surface trap material that can look dark or take on other colors.
Why does it happen?
The filiform papillae do not shed their superficial keratin layer sufficiently. They therefore lengthen and retain food debris and microorganisms. Embedded substances produce discoloration; dry mouth, tobacco, and some medications can contribute.
Frequency
Black hairy tongue is observed at very different rates in different groups. No universally applicable population prevalence can be given here; oral conditions and contributing factors play a role.
Frequency is a qualitative description, not your individual probability.
Is it normal?
The change is usually benign and reversible.
When to seek advice
Persistent unexplained discoloration, pain, bleeding, or a sore should be assessed by a dentist; do not stop medications on your own.
Does this happen to you?
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Sources (1)
- Schwarze Haarzunge: Symptome, Ursachen und Behandlung (opens a new tab)
This source supports the description and physiological context of this entry.
Editorial update: . AI-assisted research and editing; not individually reviewed by a physician. How we research
