The phenomenon of 40-year-old buck teeth can be corrected by performing orthodontic treatment, orthodontic orthognathic combined treatment, periodontal surgery, etc. Different treatments are needed according to the causes of buck teeth. 1. Orthodontic treatment: If the phenomenon of buck teeth at the age of 40 is caused by odontogenic factors, it can be corrected by wearing metal braces or invisible braces, which usually need to be worn for 1 to 2 years. At the same time, it should be noted that with the age of the human body’s bone density, correction is relatively more difficult, and the effect of correction is also poor. 2. Orthodontic and orthognathic treatment: If an older patient has buck teeth at the age of 40 due to osteogenic factors, he or she needs to go to the hospital to take a panoramic film and a lateral cephalometric film to analyze the situation, and then orthodontic and orthognathic treatment can be carried out to correct the phenomenon of underdevelopment or overdevelopment of the alveolar bone. 3. Periodontal surgery: If the 40-year-old patient is due to periodontal disease factors leading to tooth displacement and deformation caused by the buck teeth phenomenon, you need to go to the hospital stomatology department in a timely manner to carry out basic scaling and periodontal scraping surgery to control the progression of periodontitis, and the use of periodontal fibers for ligation and fixation in order to improve the phenomenon of buck teeth.