The face is mainly composed of fat, muscles and bones. Tooth extraction will never affect fat and muscle, so we study the relationship between tooth extraction and bone. Then let's first understand what happens after tooth extraction: the tooth grows on the alveolar bone. After tooth extraction, the blood will form a blood clot in the alveolar fossa 15-30min, and granulation tissue will invade the blood clot from all sides 48-72 hours after operation, and the blood clot will begin to form in about 7 days. At this time, new non-mineralized bone has been formed, which gradually fills the extraction socket and the height of the alveolar socket gradually decreases. Epithelium grew from gingival margin to the surface of alveolar fossa 3-4 days after operation, and gradually covered the surface of alveolar fossa in about 6 weeks. At the same time, the alveolar fossa was reconstructed, and mature bone replaced immature bone, which was finally completed 3-6 months after operation. The healing process of the above tooth extraction wound is very clear, and the height of alveolar bone is also very clear, but the face shape is mainly determined by the thickness of bone. Will the thickness of buccal side (lingual absorption does not affect the face shape) also decrease? Generally speaking, bone remodeling (absorption and proliferation) on the buccal side (that is, the lateral side) is more active than that on the lingual side, and bone spurs and bony processes are more likely to occur. Through the clinical trial of half a year, it was found that the average horizontal bone absorption was 4.56mm and the vertical bone absorption was 1.50 mm 6 months after tooth extraction, and the height and width decreased the most in the first 3 months after tooth extraction. Daniele's research shows that under the action of osteoclasts, the alveolar ridge of maxilla is absorbed by buccal and lingual bone after operation, but it is more obvious in buccal direction, and the loss of width of maxillary alveolar ridge is more obvious than the loss of height. It has been reported that the average alveolar ridge width will be absorbed from 9. 1mm to 6.4mm without using the extraction site preservation technique. A systematic review last year showed that the width of alveolar bone decreased by an average of 3.8mm and the height decreased by an average of 1.24mm six months after tooth extraction. Leblebicioglu and others said that the initial alveolar bone width was positively correlated with alveolar bone absorption, and so on.

Therefore, after simple tooth extraction, cheekbones will indeed be absorbed. The total width is about 4mm smaller, and the buccal side will absorb 2-3mm at most, but please note that there are still three problems. 1 People's alveolar bone is inclined, even if the width is absorbed by 3mm, the reduction of face width in front will actually be smaller. Take the extraction of wisdom teeth as an example, the alveolar bone absorption is mainly around the alveolar fossa, but the face shape is determined by the edge of the bone, that is, the red circle, so the edge absorption away from the extraction fossa will decrease accordingly. It cannot be calculated here. I can only estimate the edge inward absorption 1mm, which is already very powerful. The alveolar bone reconstruction at the tooth extraction site is only a part of the face (most people just pulled out two wisdom teeth, how many more do you want to pull out? ), the influence on the surface type is even smaller. At this point, it can be considered that simple tooth extraction will reduce the width of alveolar bone, but there is no obvious change in facial type.