What is a white coat that cannot be brushed off like a layer of fluff?

Tongue coating white thick brush off like a layer of fluff, may be caused by poor oral hygiene, oral dryness, digestive system problems and other reasons. 1. Poor oral hygiene food debris, bacteria and other microorganisms in the mouth breeding, forming tongue coating. Poor oral hygiene habits, such as not brushing your teeth frequently, using improper oral cleaning tools, or brushing your teeth incorrectly, may cause the tongue to be white and thick and difficult to brush off. 2. Dry mouth Insufficient saliva secretion or dry mouth may make the tongue more likely to accumulate and become white and thick, which may be related to certain diseases, drug side effects, or environmental factors. 3. Digestive system problems Digestive system disorders, such as indigestion, acid reflux, gastrointestinal diseases, etc., may lead to abnormal tongue coating. The formation of tongue coating is related to secretions and bacteria in the digestive process. Digestive system problems may affect the normal metabolism of these substances. If the tongue is white and thick and lasts for a long time, or if it is accompanied by other discomfort symptoms such as bad breath, mouth pain, indigestion, etc., it is recommended to consult a dentist or doctor for further examination and diagnosis. The doctor can perform oral examination, ask about medical history, and may perform relevant laboratory tests to determine the specific cause and provide appropriate treatment recommendations.