If you have dry mouth, high blood sugar levels, or if you smoke or take antibiotics, you are more likely to have fungal infections in your mouth. Thrush is such a fungal infection. It appears to occur more frequently among people with diabetes.
Thrush causes white or red patches in the mouth that may be sore or may become ulcers. It may attack the tongue and cause a painful, burning sensation. This can make it difficult to swallow and dull your sense of taste. Regular oral hygiene can help keep thrush in check. If necessary, your dentist may prescribe antifungal medications to treat this condition.