Alveolar bone resorption is mainly due to inflammation, trauma and other factors that lead to the loss of alveolar bone components, showing a decrease in the height and density of the alveolar bone as a pathological change of periodontitis. It can lead to loss of supporting tissues of the periodontium, gradual loosening of the teeth, and eventually loss. The modes of alveolar bone resorption include horizontal resorption, vertical resorption, and pit resorption, among which horizontal resorption is the main mode of alveolar bone resorption. The degree of alveolar bone resorption is divided into three degrees, degree I is alveolar bone resorption in 1/3 of the root neck; degree II refers to alveolar bone resorption more than 1/3 of the root, but within 2/3; degree III refers to alveolar bone resorption has exceeded 2/3 of the root. in case of alveolar bone resorption, root tip parallel projection photograph, curved body layer film, cone beam CT and other related examinations should be carried out under the guidance of the doctor, and after clear diagnosis, should be early and as soon as possible The periodontitis should be controlled as soon as possible to prevent further development of the disease, and the formed bone defect should also be treated restoratively. However, because the alveolar bone is deep, the treatment is usually based on surgery, including bone forming, bone grafting and bone tissue regeneration. At the same time, we should pay attention to good dietary hygiene habits, keep our mouth clean and hygienic, brush our teeth in the morning and evening, and rinse our mouth after meals to avoid periodontal diseases.