Lingual coating, also known as tongue biofilm or tongue plaque, is a common condition in the oral cavity characterized by a whitish, yellowish, or brownish layer on the dorsal surface of the tongue.
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✅ Clinical Characteristics of Lingual Coating
The main clinical features include:
° Whitish or yellowish appearance on the dorsal surface of the tongue.
° Pastelike or sticky texture.
° Halitosis (bad breath) present in most cases.
° Dry mouth sensation or unpleasant taste.
° Possible dysgeusia (altered taste) or burning tongue sensation.
The most commonly affected area is the posterior dorsal region, where filiform papillae are more abundant, facilitating retention of debris and microorganisms.
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The tongue harbors a complex microbiota of both aerobic and anaerobic bacteria. Lingual coating is especially associated with a high concentration of Gram-negative anaerobic bacteria that produce volatile sulfur compounds (VSCs), the main cause of halitosis.
➤ Key bacterial species identified:
° Porphyromonas gingivalis
° Fusobacterium nucleatum
° Prevotella intermedia
° Treponema denticola
° Tannerella forsythia
° Solobacterium moorei
These bacteria break down proteins from food and epithelial cells, producing VSCs such as hydrogen sulfide (H₂S), methyl mercaptan, and dimethyl sulfide, which are highly volatile and malodorous.
A recent metagenomic study by Seerangaiyan et al. (2017) confirmed that the tongue is one of the most microbiologically diverse sites in the oral cavity.
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Several factors contribute to the development of lingual coating:
1. Poor oral hygiene
Failure to brush the tongue promotes debris and microbial buildup.
2. Xerostomia (dry mouth)
Reduced salivary flow impairs the self-cleansing ability of the tongue.
3. Tobacco and alcohol use
These habits disrupt the oral flora and irritate the tongue’s surface.
4. Systemic diseases
Conditions like diabetes, chronic kidney disease, or gastrointestinal infections can manifest with tongue coating.
5. Use of antibiotics or antiseptic mouthwashes
Certain medications can alter the oral microbiome.
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Though often considered minor, lingual coating can lead to significant consequences:
° Chronic halitosis: The primary source of intraoral bad breath (Morita & Wang, 2001).
° Taste alterations: Due to mechanical obstruction of taste buds.
° Psychological discomfort: Bad breath may lead to social anxiety or isolation.
° Risk of periodontal disease: Lingual bacteria can colonize the gums.
° Indicator of systemic conditions: May be an early sign of candidiasis or immunosuppression.
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Effective preventive strategies include:
° Daily tongue cleaning: Using tongue scrapers or brushes with a cleaner surface.
° Proper oral hygiene: Brushing and flossing to reduce overall biofilm.
° Antimicrobial mouth rinses: Chlorhexidine 0.12% or zinc lactate in severe cases.
° Adequate hydration: To stimulate saliva production.
° Avoidance of tobacco and alcohol.
° Regular dental visits: For professional evaluation and monitoring.
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Treatment should be multifactorial and individualized, addressing the underlying cause:
1. Tongue scraping
° Mechanical removal of coating using specialized tools—highly effective and affordable.
2. Antimicrobial therapy
° Rinses with chlorhexidine, cetylpyridinium chloride, or chlorine dioxide to reduce microbial load.
° Antibacterial toothpastes may support overall reduction of pathogens.
3. Correction of predisposing factors
° Manage dry mouth and systemic conditions (e.g., diabetes, kidney failure).
° Eliminate irritants such as smoking or alcohol.
4. Complementary therapies
° Oral probiotics (e.g., Lactobacillus reuteri) to modulate microbiota.
° Patient education on hygiene techniques and healthy lifestyle choices.
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Lingual coating is more than an aesthetic concern. It reflects microbial imbalances in the oral ecosystem and can impact systemic and psychosocial health. Its prevention and treatment are simple yet require consistency and patient education. A comprehensive approach—addressing both local and systemic factors—is essential for effective management.
📚 References
✔ Morita, M., & Wang, H. L. (2001). Association between oral malodor and adult periodontitis: a review. Journal of Clinical Periodontology, 28(9), 813–819. https://doi.org/10.1034/j.1600-051x.2001.028009813.x
✔ Seerangaiyan, K., Jüch, F., Winkel, E. G., & Winkelhoff, A. J. V. D. (2017). Tongue Microbiome in Healthy Subjects and Patients with Intra-Oral Halitosis. Journal of Breath Research, 11(3), 036010. https://doi.org/10.1088/1752-7163/aa6f9e
✔ Takeshita, T., Suzuki, N., Nakano, Y., & Yamashita, Y. (2008). Relationship between oral malodor and the global composition of indigenous bacterial populations in saliva. Applied and Environmental Microbiology, 74(2), 562–569. https://doi.org/10.1128/AEM.02039-07
✔ Tangerman, A., & Winkel, E. G. (2010). Intra- and extra-oral halitosis: findings of a new classification. Journal of Clinical Periodontology, 37(9), 807–814. https://doi.org/10.1111/j.1600-051X.2010.01699.x
✔ Faveri, M., Gonçalves, L. F., Feres, M., Figueiredo, L. C., & de Figueiredo, C. A. (2006). Prevalence and microbiological diversity of tongue coating in subjects with and without halitosis. Revista da Associação Paulista de Cirurgiões Dentistas, 60(2), 150–155.
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