Dental tissues consist of dentin, dentin, enamel and pulp, of which enamel is the hardest component in the body. Enamel has no internal nervous system, is milky white, has some transparency, is permeable and helps ions to pass through. To determine whether the enamel is damaged, can be clarified by clinical manifestations. 1.Appearance: When enamel is damaged, the underlying light yellow dentin can be exposed, the tooth is chipped or cracked, the tooth surface is sunken, staining is evident after eating, and the patient is overly sensitive to temperature, sweets, etc. 2.Complications: When the outer layer of enamel is damaged, the tissue fluid in the mouth and the liquid ions around the teeth can easily penetrate into the pulp through the pore-like structure of the dentin, thus causing various dental diseases, such as tooth allergy, pulpitis, periodontitis, etc. In order to prevent enamel damage, we should pay attention to maintaining good oral hygiene, suggesting brushing and flossing; controlling the intake of sugary or acidic foods and drinks to improve the oral environment; avoiding the use of mouthwash containing alcohol to avoid reducing the durability of enamel and avoiding staining; correcting bad habits such as clenching or grinding teeth in a timely manner; and going to the dental hospital regularly for dental examination and cleaning is The basic measures to prevent and control enamel damage.