Dehydration makes things worse, starving the mouth of saliva, its natural cleansing system,
and allowing a stubborn white film to spread, especially at the back of the tongue.
But sometimes, the warning is louder. Oral thrush, caused by Candida overgrowth, creates thick, cottage
cheese-like patches that may bleed when scraped and often signal weakened immunity, diabetes,
or heavy antibiotic or steroid use. More rarely, firm white plaques
that won’t scrape off can be leukoplakia, occasionally precancerous and strongly linked to tobacco.
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Any white coating that persists, hurts, or changes
demands more than a new mouthwash—it deserves a professional exam, and your full attention.
