Haze is the result of the interaction between specific climatic conditions and human activities. Economic and social activities of high population density will inevitably emit large amounts of fine particulate matter (PM2.5), and once emissions exceed the capacity and carrying capacity of the atmospheric circulation, fine particulate matter concentrations will continue to accumulate, at which point widespread haze is highly likely to occur if influenced by static weather, etc. In addition to the haze has an impact on the whole body system, it can also lead to dental damage, such as caries, tooth discoloration, dental erosion, dentin allergy, dental pulp disease, periodontal mucosa and other soft tissue diseases, salivary gland diseases, etc. The following only talk about a few of the common effects ↓ ↓ 1, haze leads to tooth discoloration (dental fluorosis) Air pollution and tooth discoloration have a certain relationship. An important part of haze is car exhaust, and car exhaust is rich in lead compounds, which may lead to black teeth when inhaled for a long time; women during pregnancy or infants inhale fluoride haze with high content for a long time, which may cause dental fluorosis. 2.Haze induces children’s caries The main reason of caries formation is the metabolic activity of harmful bacteria, and the caries-causing mechanism of haze is due to its obvious effect on the mineral metabolism of saliva. The above shows that there is some correlation between the degree of haze contamination by dust, nitrogen oxides, sulfur dioxide, lead, carbon monoxide and the process of caries in children, and the effect of carbon monoxide is the main one. It should be noted that atmospheric pollution is obviously not the etiological factor of dental caries, but the change of oral mineral metabolism caused by atmospheric pollution, the disturbance of internal environmental stability and the decrease of salivary defense performance will increase the risk of caries. 3.Cold haze day is easy to cause toothache. When there is cold haze day, the resistance ability of the body will be reduced, which will induce or aggravate the oral disease. The most suitable temperature for teeth is 10℃~50℃, the temperature is too low and too high, there will be a reaction, if it is beyond the tolerance value for a long time, it may lead to dental pulp lesion and cause toothache. Therefore, it is more important to pay attention to oral health care in cold weather. The impact of haze on oral health should not be underestimated, each type of damage, etiology, history and complications have common features, but clinical manifestations, preventive principles and prognosis have their own characteristics. Pay attention to the impact of haze on oral health, prevention-oriented, maintain oral hygiene, if necessary, to the dental clinic or hospital examination, depending on the severity of the disease, the occurrence of the site, the size of the area, the use of different methods of treatment, symptomatic treatment, must pay attention to the prevention and treatment of oral diseases that produce related symptoms. Reminder cherish teeth, simple and easy three measures to help you guard dental health: 1, brush your teeth every morning and evening, use dental floss, mouthwash. 2.Go to the dental hospital for regular checkups and clean your teeth every six months or once a year. 3, actively prevent and control periodontal disease, once the tooth decay, loss, etc. should be treated in time to avoid the proliferation of bacteria in the mouth, increasing the risk of heart and lung health by infection.