Mouth has been rotten for the following reasons: First, due to the lack of vitamins and trace elements in the body, if the lack of B vitamins, vitamin C or trace elements in iron and zinc, are easy to cause the oral mucosa suffering from diseases, such as suffering from mouth ulcers, flat moss and other oral inflammatory diseases, which will appear all the time rotten mouth situation. Second, due to incorrect eating habits damage caused by some people like to eat spicy and irritating food for a long time, such as the preference to eat hot pot, hot and spicy food, this stimulation will cause the oral mucosa often ulcerated. Third, to be alert to whether suffering from fungal stomatitis, common in children with low immune function or the elderly. Because children have to feed tableware is not disinfected in a timely manner, or the elderly immune system is excessively low, as well as long-term wear movable denture of the elderly, are prone to fungal stomatitis caused by long-term erosion in the mouth.