Final Answer:
The most commonly purported cause of hairy tongue is Poor oral hygiene.Thus the option a. Poor oral hygiene is correct.
Step-by-step explanation:
Hairy tongue, or lingua villosa, is a benign and reversible condition characterized by elongation of filiform papillae on the tongue's surface, giving it a "hairy" appearance. Poor oral hygiene, as indicated by option (a), is widely recognized as a primary factor contributing to the development of hairy tongue. The accumulation of debris, bacteria, and dead cells on the tongue's papillae can create a conducive environment for the elongation of these structures, leading to the characteristic appearance associated with this condition.
Excessive caffeine consumption (option b), genetic predisposition (option c), and lack of sleep (option d) are not typically identified as direct causes of hairy tongue. While certain lifestyle factors may contribute to oral health, they are not the primary drivers of this specific condition. Understanding the etiology of hairy tongue is crucial for its management, and in the case of poor oral hygiene, promoting good oral care practices, such as regular tongue cleaning and maintaining proper dental hygiene, can help prevent and alleviate the symptoms associated with hairy tongue.
In conclusion, poor oral hygiene stands out as the most commonly cited cause of hairy tongue. Practicing effective oral care routines is essential for preventing the accumulation of debris and bacteria on the tongue, thereby reducing the risk of developing this benign but visually distinct condition.
Thus the option a. Poor oral hygiene is correct.