“If your tongue is white, this is a clear sign that you are suffering from an imbalance or condition that affects your oral health or overall well-being.”

A white tongue happens when the papillae (tiny bumps on your tongue) swell and trap debris, bacteria, or dead cells. This can be caused by poor oral hygiene, dehydration, dry mouth, smoking, or drinking alcohol.

Sometimes, a white tongue points to a more serious condition. “Thrush,” a yeast infection, is common in people with weak immune systems or those on antibiotics. “Leukoplakia causes white patches and can sometimes be precancerous,” especially in smokers. Another possible cause is “lichen planus,” an inflammatory disease affecting the mouth’s soft tissues.

In most cases, a white tongue is harmless. But if it lasts over a week, or comes with pain, burning, or trouble eating or talking, it’s best to see a doctor.

To keep your tongue healthy, brush regularly, stay hydrated, and avoid smoking and alcohol.