A subtle change on your tongue that many people dismiss could be an early warning sign of something far more serious, a dentist has advised . Experts say persistent tongue symptoms are often ignored or mistaken for minor irritation, but in some cases they can signal oral cancer or other underlying health conditions . Dr Andrej Bozic, oral surgeon at Dentum , said the key sign to watch for is a symptom that does not go away. He said: "One of the most important warning signs is a tongue ulcer or