The main danger of smoking for teeth is that it is a high risk factor for periodontal disease, especially severe periodontitis, and many patients who smoke have a higher prevalence of periodontitis, which is more serious and more likely to lead to tooth loss. Because smoking affects the local defense function, it also reduces the local oxygen content, which is conducive to the growth of some anaerobic pathogenic bacteria in the periodontium, and smoking leads to poor oral hygiene, the surface of the teeth is more likely to accumulate plaque and calculus, more likely to produce adverse stimulation around the teeth, smoking also inhibits the growth of fibroblasts and osteoblasts, more likely to lead to alveolar bone resorption, so that Smoking is a high risk factor for periodontitis, and treatment for periodontitis patients generally requires that they quit smoking first.