If you have bad breath and thick white tongue moss, one may be caused by poor oral hygiene for a long time, and the second may be caused by fire in the body. 1, people with poor oral hygiene, due to long-term lack of serious brushing and rinsing, and do not regularly go to the hospital for ultrasonic dental cleaning, the surface of the tongue and teeth will retain a lot of food residue, bacteria and soft scale, so it will make the tongue moss white and thick, and at the same time will appear bad breath. 2, the body on fire people will also make the appearance of bad breath and tongue moss white thick, common in the crowd of stomach fire, stomach fire is mostly due to long-term consumption of greasy, indigestible food. Or every meal are too full, after the meal and not the right amount of exercise, so that the stomach for a long time there are symptoms of food accumulation, food in the stomach after staying too long will cause the stomach fire, stomach fire up to the mouth will cause a sour taste in the mouth, and the tongue is white and thick.