Enamel erosion is the erosion of the hard, white, translucent, most calcified tissue of the outer layer of the crown of a tooth, causing damage. When we consume foods with high acid content for a long period of time, the enamel on the surface of the teeth will erode and decalcify. When the enamel has abrasion, it reveals the dentin and is yellowish. Damage to the enamel is a microscopic manifestation that is not easy to detect with the naked eye, but it will produce some secondary conditions, such as pulpitis, periodontitis, and gingival recession. The examination and diagnosis of tooth enamel erosion Dental pulp cold and hot diagnosis: normal dental pulp does not feel pain for 20 ~ 50 ℃ water close to the mouth temperature, 10 ~ 20 ℃ cold water and 50 ~ 60 ℃ hot water rarely cause pain, so to lower than l0 ℃ for the cold stimulation, higher than 60 ℃ for the hot stimulation. When the pulp is diseased, it may show sensitivity or retardation to hot and cold stimuli, and its diagnostic value is relative due to the possibility of a number of pseudo-responses. It is necessary to measure the control tooth first, and then measure the affected tooth, and must be combined with other examination results to make a comprehensive judgment. Whether cold or hot, the test site should be on the labial or buccal surface of the tooth in the middle 1/3, because the enamel is more complete, causing a comparable response. When enamel is abraded, it reveals dentin and is yellowish in color. Enamel is located on the surface of the crown and is a hard, white, transparent layer of tissue that protects the dentin and pulp tissue inside the tooth. Therefore, a bright and intact enamel is a guarantee of healthy teeth. When we consume foods with high acid content for a long time, the enamel on the surface of the teeth will be decalcified. Therefore, to prevent tooth enamel erosion, we should avoid long-term consumption of acid-containing foods.