Refinery discusses reasons why a tongue may turn white, stating that one cause is a film building up on tongues from poor oral hygiene. Other conditions may affect the color and appearance of tongues, such as fungal infections, yeast infections, inflammatory conditions, and cancer. The article advises brushing tongues regularly and seeing a dentist for any concerns.
MouthHealthy.org and the Oral Health Topics on ADA.org provide information on oral cancer for patients and for dental professionals. MouthHealthy.org also provides information on thrush and tongue scrapers.