Smoking is bad for your oral health. Because adolescents are growing and developing, the dangers of smoking are more serious than for adults. Smoking can cause a disease called “oral mucosal leukoplakia”. The white spots on the lips are mostly located in the lower lip, and most of them are in the middle and outer l/3 junction of the lips, which is exactly the place where people are used to holding cigarettes, which can explain the relationship between cigarette smoking and white spots. White spot is a kind of precancerous lesion, about 4-7% can be transformed into oral cancer. According to statistics, 93.1% of the patients with oral white spots are smokers. Smoking will stimulate the gums, easy to get periodontal disease, and the condition is also more serious. Recently, scientists in Sweden confirmed that: in the serious periodontal disease patients, 80% are smokers; smokers periodontal disease rate for non-smokers 3 times; smokers than non-smokers on average, more than the average loss of two teeth. Although smoking is not the root cause of periodontal disease, it is one of the important triggers. From the aesthetic point of view, smoking can make the teeth with a layer of yellowish-brown smoke stains, affecting the appearance. Smokers often have a bad taste in their mouth, which affects their social and work life.