1. Poor Oral Hygiene: The most common cause of a white tongue is poor oral hygiene. When you fail to brush your tongue or clean your mouth properly, bacteria, dead cells, and food particles can accumulate on the surface of the tongue. This buildup leads to a white coating, especially on the back of the tongue. Regular brushing and flossing, along with using a tongue scraper, can help prevent this condition.

2. Dehydration: Dehydration is another possible reason for a white tongue. When your body doesn’t get enough fluids, the mouth can become dry, which reduces the production of saliva. Saliva is essential for washing away food particles and bacteria from the tongue. Without it, a white coating can form. Drinking plenty of water and staying hydrated can alleviate this issue.

3. Oral Thrush: Oral thrush, a fungal infection caused by the overgrowth of the Candida yeast, can also cause a white coating on the tongue. This condition often appears as creamy white patches that can be scraped off but may leave red, sore areas behind. Those with weakened immune systems, diabetes, or taking antibiotics or steroids are more susceptible to oral thrush. Treatment typically involves antifungal medication prescribed by a healthcare provider.