Oral mucosal fibrosis often occurs in people between the ages of twenty and forty years, and the disease often occurs in the posterior cushion area and the buccal mucosa. It occurs mainly in India, but is also seen in Vietnam and Thailand. Taiwan and Hunan Xiangtan in China are also high prevalence areas of this disease. 1, oral mucosal ulcers: oral ulcers, also known as “mouth sores”, is a superficial ulcer on the oral mucosa, the size can be from rice to soybean size, round or ovoid, ulcer surface for oral ulcer concave, surrounding congestion, can cause pain due to irritating food, generally one to two weeks can be self-healing. 2, oral mucosa detachment: oral mucosa detachment is the general term for all diseases occurring or reflected in the oral mucosa tissue. Common oral mucosa detachment diseases are acute allergic labyrinthitis, drugged mouth, radiation stomatitis and erythema multiforme. The common symptom of oral mucosal detachment is extensive oral erosion, including cheek, tongue, palate, gums, floor of mouth, tongue belly, pharynx, uvula, upper and lower lips. 3, the oral mucosa has a patch of film shaped like milk lumps: the oral mucosa appears milky white dots or fused into pieces, rather like milk lumps, the white film covers the oral gum mucosa, not easy to erase. The white film covers the mucous membrane of the oral glue and cannot be easily removed. At the beginning, it becomes small flakes and gradually fuses into a large area, resembling milk fast. It is a clinical manifestation of thrush in newborns. Neonatal thrush is caused by the infection of the oral mucosa with Candida albicans (a genus of mycobacteria). The mucous membrane appears as milky white dots or fused into pieces, rather like milk lumps, and the white film covers the mucous membrane of the oral cavity and is not easily wiped away. Initially into small flakes, gradually fused into a large, shaped like milk fast. This disease is caused by Candida albicans infection. This fungus can sometimes be found in the mouth when the infant is malnourished or weakened can develop. Newborns are mostly infected by the birth canal or spread by unclean nursing teats or contamination of the feeder’s fingers. 4, white harder raised plaques on the oral mucosa: plaque white spots: white or gray-white homogeneous type harder plaques on the oral mucosa, dense texture, damage pattern and area vary, mildly raised or uneven. It is important to note that there is no parallel between the size of the damage and the possibility of cancer, which sometimes occurs even when it is only the size of a grain of rice. It is often difficult to distinguish plaque damage from leukoplakia when seen with the naked eye, but the former is harder when looked at. It is a clinical manifestation of oral mucosal leukoplakia.