White color under the tongue may be ulcers, white spots, burns, sublingual gland duct stones and other diseases, and it is recommended to consult a doctor for examination in time. 1. The whiteness under the tongue is surrounded by a red halo and is depressed, which may be an ulcer under the tongue, and is usually painful. 2. white under the tongue may be oral leukoplakia, long-term smoking, betel nut chewing bad habits may occur, it is recommended to consult a doctor in time to use medicine. 3. If you eat too hot food, it may lead to the formation of ulcers on the underside of the tongue, which may cause the whitening of the underside of the tongue. 4. If there are stones in the duct of the sublingual gland that block the duct opening, the duct opening may turn white due to lack of blood flow. It is recommended to consult a doctor if you have symptoms of whitening under the tongue.