A white tongue could be a sign of oral thrush, a yeast infection in the mouth. It usually appears as white, cottage cheese-like patches. This condition is more common in infants, the elderly, denture wearers, diabetics, and those with weakened immune systems. If you notice these symptoms, consult a doctor for proper diagnosis and treatment. Antifungal medications are usually effective, and treating any underlying conditions, such as uncontrolled diabetes or poor denture hygiene, can help prevent recurrence. Practicing good oral hygiene, rinsing your mouth after using inhalers, managing blood sugar levels, and properly cleaning dentures can significantly reduce the risk of oral thrush.