The wide jaw bone may be caused by the following reasons: First, it may be caused by some old injuries to the jaw bone, such as old fractures of the jaw bone, which may leave behind some bony deformities or excessive bone growth, thus causing the jaw bone to become wider and larger. Second, it may be due to genetic factors. Some patients are born with a wider and larger mandible than others due to genetic factors. Third, may be due to acromegaly, some patients after the end of growth, due to the existence of such diseases, some short bones will continue to grow, will lead to longer and larger facial bones compared to other people, then it will cause the jaw this part is larger compared to other people. Fourth, it may be caused by the patient chewing some hard food for a long time, some patients chew hard food for a long time, it will cause the muscles around the jawbone to be very developed, which will also make the jawbone look wider.